[MD1] Disabling the CFM-68K Runtime
TweetFollow Us on Twitter

[MD1] Disabling the CFM-68K Runtime

Apple recommends customers disable the CFM-68K Runtime Enabler extension

Apple Computer has discovered a bug in the CFM-68K Runtime Enabler
extension that can affect the stability of Macintosh computers based on the
680x0 processor. This extension allows the use of certain applications on
680x0 computers, and is installed by an application installer only if the
application requires the extension. Customers will know they have this
extension installed if the file " CFM-68K Runtime Enabler" (note that the
file name begins with a space) is located in their Extensions folder which
resides inside their System folder.

In certain circumstances, the bug can cause applications which rely on the
CFM-68K Runtime Enabler to not function properly, resulting in application
instability and potential loss of data. The most obvious symptoms are what
appear to be random system crashes and hangs. Macintosh and Mac
OS-compatible computers based on the PowerPC processor are not affected by
this bug.

Because of the potential quality impact of this bug, Apple is recommending
that customers with computers based on the 680x0 processor disable the
CFM-68K Runtime Enabler extension and not use programs which rely on this
extension. See below for instructions on how to disable this extension.
Apple is currently working to resolve this bug.

What is the CFM-68K Runtime Enabler?

The CFM-68K Runtime Enabler is an extension which makes it easier for
developers of applications to design their programs to run on both 680x0
and PowerPC computers without having to write separate programs for both
processor families.

On a more technical level, the Code Fragment Manager ("CFM") was originally
introduced by Apple only for Macintosh and Mac OS-compatible computers
based on the PowerPC processor. It allows applications to share their
programming code through special files known as shared libraries. In
addition to being able to share programming code, applications which are
programmed to use shared libraries can reduce their memory requirements. In
response to the success of the PowerPC version of CFM, Apple introduced a
version of CFM for Macintosh computers based on the 680x0 processor. This
version of CFM for 680x0-based Macintosh computers is the CFM-68K Runtime
Enabler extension.

What applications are affected by this bug?

Only applications which have been explicitly programmed to use the CFM-68K
Runtime Enabler can be affected by this bug. Apple Computer products which
rely on CFM-68K Runtime Enabler are: OpenDoc, Cyberdog, LaserWriter
(versions 8.4 and 8.4.1 only), and the Apple Media Tool. Only the 68k
versions of these software packages are affected. This bug does not affect
PowerPC versions of these products. There are currently few applications
which rely on the CFM-68K Runtime Enabler and therefore Apple does not
believe that this problem is very widespread.

You can identify applications which rely on the CFM-68K Runtime Enabler
extension once the extension is disabled (see below for instructions on
disabling the extension). When the CFM-68K Runtime Enabler is disabled,
applications which rely on it will report the following error when you
attempt to launch them:


Is this bug caused by these applications?

Not directly. The bug is caused by the use of CFM-68K Runtime Enabler in
ways it was not designed to handle. Unfortunately, its limitations were not
recognized by the applications.

What should I do if I have installed one of these affected products?

If you have installed OpenDoc or Cyberdog, you should not use these
products until Apple releases a solution for this problem. If you have
installed LaserWriter version 8.4 or 8.4.1, you should install LaserWriter
version 8.3.4, which does not rely on the CFM-68K Runtime Enabler. If you
do not have LaserWriter 8.3.4, you can download it from the Apple support
site on the World Wide Web, which is located at:


If you are a member of the Apple Media Tool developer community, please
visit the AMT web site at http://amt.apple.com/ for more information.

If you have a PowerPC-based Macintosh or Mac OS-compatible computer, your
computer is not affected by this problem. Therefore, you can continue to
use these products.

Should I contact third-party application developers about this problem?

No. Since a fix for this problem will be accomplished by modifying Apple's
CFM-68K Runtime Enabler, third-party application developers will be unable
to assist you with this problem.

How do I disable this extension?

There are two ways to disable this extension. One is to drag the extension
out of the Extensions folder which resides in your System Folder. The other
is to use the Extensions Manager control panel.

To disable the CFM-68K Runtime Enabler extension using the Extensions
Manager control panel, perform the following steps:

1. Open the Apple menu item and select Control Panels.

2. Locate Extensions Manager and double click it to open it.

3. Locate " CFM-68K Runtime Enabler". Note that there is a space at the
beginning of the name. You should find this extension near the top of the
Extensions Manager window under the Extensions heading, similar to this:


4. If there is a check mark ("") next to CFM-68K Runtime Enabler, click on
it so that there is no check mark.

5. Close the Extensions Manager window.

6. Restart your computer.

Is this bug caused by recent changes in the CFM68k Runtime Enabler?

No. This bug exists in all currently shipping versions of CFM-68K Runtime
Enabler, but was found during recent testing.

Why has it taken Apple this long to identify this bug?

Only recently have applications begun to make use of the CFM-68K Runtime
Enabler extension. The conditions which cause this bug have only been
exposed by recent increased use of the extension by applications.

I have a PowerPC computer. Does this affect me?

No. The bug is only in the CFM-68K Runtime Enabler extension, which runs
only on Macintosh computers based on the 680x0 processor. The Mac OS on
PowerPC computers does have code fragment capabilities, but it is
accomplished through different programming techniques not affected by this

What is Apple doing to fix this bug?

Apple has assigned a team of engineers to develop a solution for the bug.
At this time, there is not enough information to make any statements about
delivery of a solution.

How can I get the technical details about this bug?

Apple has a Technote about this bug available on the World Wide Web at:



Community Search:
MacTech Search:

Software Updates via MacUpdate

AirPort Utility 6.3.6 - Set up and manag...
Note: Most recent release available only within OS X 10.11 El Capitan update. Use AirPort Utility to set up and manage your Wi-Fi network and AirPort base stations, including AirPort Express, AirPort... Read more
Quicksilver 1.3.1 - Application launcher...
Quicksilver is a light, fast and free Mac application that gives you the power to control your Mac with keystrokes alone. Quicksilver allows you to find what you need quickly and easily, then act... Read more
Tidy Up (Five Users) 4.1.5 - Find duplic...
Tidy Up is a complete duplicate finder and disk-tidiness utility. With Tidy Up you can search for duplicate files and packages by the owner application, content, type, creator, extension, time... Read more
Mellel 3.4.3 - The word processor of cho...
Mellel is the leading word processor for OS X and has been widely considered the industry standard since its inception. Mellel focuses on writers and scholars for technical writing and multilingual... Read more
Skype - Voice-over-internet p...
Skype allows you to talk to friends, family and co-workers across the Internet without the inconvenience of long distance telephone charges. Using peer-to-peer data transmission technology, Skype... Read more
Bookends 12.6.0 - Reference management a...
Bookends is a full-featured bibliography/reference and information-management system for students and professionals. Access the power of Bookends directly from Mellel, Nisus Writer Pro, or MS Word (... Read more
Apple iBooks Author 2.4 - Create and pub...
Apple iBooks Author helps you create and publish amazing Multi-Touch books for iPad. Now anyone can create stunning iBooks textbooks, cookbooks, history books, picture books, and more for iPad. All... Read more
Web Snapper 3.3.9 - Capture entire Web p...
Web Snapper lets you capture Web pages exactly as they appear in your browser. You can send them to a file as images or vector-based, multi-page PDFs. It captures the whole Web page - eliminating the... Read more
Tunnelblick 3.6beta10 - GUI for OpenVPN...
Tunnelblick is a free, open source graphic user interface for OpenVPN on OS X. It provides easy control of OpenVPN client and/or server connections. It comes as a ready-to-use application with all... Read more
EtreCheck 2.5.1 - For troubleshooting yo...
EtreCheck is a simple little app to display the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support... Read more

Camel Up (Games)
Camel Up 1.0.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.0 (iTunes) Description: | Read more »
The Martian: Bring Him Home (Games)
The Martian: Bring Him Home 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: Based on the best selling novel and critically acclaimed film, THE MARTIAN tells the story of Astronaut Mark... | Read more »
This Week at 148Apps: September 21-30, 2...
Leap Into Fall With 148Apps How do you know what apps are worth your time and money? Just look to the review team at 148Apps. We sort through the chaos and find the apps you're looking for. The ones we love become Editor’s Choice, standing out above... | Read more »
Tweetbot 4 for Twitter (Social Networki...
Tweetbot 4 for Twitter 4.0 Device: iOS Universal Category: Social Networking Price: $4.99, Version: 4.0 (iTunes) Description: *** 50% off for a limited time. *** | Read more »
Mori (Games)
Mori 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: Stop, rewind and unwind with Mori. Time is always running, take a moment to take control. Mori is an action puzzle game about infinitely... | Read more »
100 Years' War (Games)
100 Years' War 1.0 Device: iOS Universal Category: Games Price: $3.99, Version: 1.0 (iTunes) Description: | Read more »
Tower in the Sky (Games)
Tower in the Sky 0.0.60 Device: iOS Universal Category: Games Price: $1.99, Version: 0.0.60 (iTunes) Description: | Read more »
hocus. (Games)
hocus. 1.0.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0.0 (iTunes) Description: New, polished, mind-bending, minimal puzzle game with dozens of levels and extra-ordinary design Features:- Beautifully crafted... | Read more »
Mos Speedrun 2 (Games)
Mos Speedrun 2 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: Mos is back, in her biggest and most exciting adventure ever! Wall-jump to victory through 30 mysterious, action packed levels... | Read more »
3D Touch could be a game-changer, but it...
Were you one of the lucky/financially secure enough ones to buy a new iPhone 6s or iPhone 6s Plus over the weekend? Yup, me too (I’m not convinced I was either of those two things, but let’s go with lucky for now), so I thought I’d delve into just... | Read more »

Price Scanner via MacPrices.net

Bare Bones Software Releases TextWrangler 5.0...
Bare Bones Software has announced the release and immediate availability of TextWrangler 5.0, a major upgrade to its free, high performance, general purpose text editor for Mac OS X. Built on a new,... Read more
Apple refurbished iPad Air 2s available for u...
Apple has Certified Refurbished iPad Air 2s available for up to $140 off the price of new models. Apple’s one-year warranty is included with each model, and shipping is free: - 128GB Wi-Fi iPad Air 2... Read more
Save up to $100 on Mac AppleCare Protection P...
Adorama has 3-Year AppleCare Warranties on sale for up to $100 off MSRP including free shipping plus NY & NJ sales tax only: - Mac Laptops 15″ and Above: $249 $100 off MSRP - Mac Laptops 13″ and... Read more
Updated Mac Price Trackers
We’ve updated our Mac Price Trackers with the latest information on prices, bundles, and availability on systems from Apple’s authorized internet/catalog resellers: - 15″ MacBook Pros - 13″ MacBook... Read more
27-inch 3.5GHz 5K iMac on sale for $81 off MS...
Adorama has the 27″ 3.5GHz 5K iMac on sale for $2218.99, $81 off MSRP, including a free copy of Apple’s 3-Year AppleCare Protection Plan, plus a free external DVD/CD drive, and a copy of Corel... Read more
12-inch MacBooks in stock for up to $120 off,...
Adorama has 12″ Retina MacBooks in stock for up to $120 off MSRP including free shipping plus NY & NJ sales tax only. For a limited time, Adorama will include a free Apple USB-C to USB Adapter,... Read more
EasyDocScan Turns your iPhone or iPad into a...
Note-Ify Apps has announced the release and immediate availability of EasyDocScan 1.0, their new business app developed for iPhone, iPad and iPod touch devices. EasyDocScan is a simple application... Read more
15-inch 2.2GHz Retina MacBook Pro on sale for...
Amazon.com has the 15″ 2.2GHz Retina MacBook Pro on sale for $1799 including free shipping. Their price is $200 off MSRP, and it’s the lowest price available for this model (except for Apple’s $1699... Read more
2.8GHz Mac mini available for $988, includes...
Adorama has the 2.8GHz Mac mini available for $988, $11 off MSRP, including a free copy of Apple’s 3-Year AppleCare Protection Plan. Shipping is free, and Adorama charges sales tax in NY & NJ... Read more
iPhone 6s and 6s Plus Feature Improved Durabi...
Upgraded components in the new iPhone 6s Plus cost $16 more than the components in the earlier iPhone 6 Plus according to a preliminary estimate from IHS Inc. The bill of materials (BOM) for an... Read more

Jobs Board

Senior Payments Security Manager - *Apple*...
**Job Summary** Apple , Inc. is looking for a highly motivated, innovative and hands-on senior payments security manager to join the Apple Pay security team. You will Read more
*Apple* Solutions Consultant - Retail Sales...
**Job Summary** As an Apple Solutions Consultant (ASC) you are the link between our customers and our products. Your role is to drive the Apple business in a retail Read more
*Apple* Site Security Manager - Apple (Unite...
**Job Summary** The Site Security Manager is a high-profile security position at Apple . The Site Manager is the face of Apple Global Security (GS) and primary point Read more
*Apple* Fulfillment Operations Execution Ana...
**Job Summary** The AMR Apple Fulfillment Operations Team is seeking a talented team player to drive the Apple Online Store (AOS) fulfillment performance to ensure a Read more
*Apple* Distinguished Educator (ADE) Communi...
**Job Summary** Apple is seeking candidates for a new position on the Apple Distinguished Educator (ADE) Program team as ADE Community Support Manager. Join a team Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.