Logic has released version 9.1.4 of Logic Express. Apple says the update improves overall stability and addresses a number of minor issues. The update is recommended for all users of Logic Express 9.
You can download Logic Express 9.1.4 at http://support.apple.com/kb/DL1015 or via the Software Update component of Mac OS X’s Systems Preferences app. It’s a 138.74MB download and requires Mac OS X 10.5.8.