Logic Pro or Logic Express version 7.2 may unexpectedly quit during launch on an Intel-based Macintosh.
This happens if the control surface preference file located at ~/Library/Preferences/Logic/com.apple.logic.pro.cs (Logic Pro) or ~/Library/Preferences/Logic/com.apple.logic.express.cs (Logic Express) is copied from a PowerPC-based Mac to an Intel-based Mac.
To resolve the issue, delete the file and then launch Logic.