Why Can't I Remove the Transitions?

Sometimes permissions and preferences can get corrupted. Whenever iMovie starts acting funny, a common maintenance procedure is to do the following: Delete preferences by closing iMovie and trashing the file com.apple.iMovie.plist found in User (the House icon)/Library/Preferences. (Klause 1 suggested this in his last post.) Then do a permissions repair using the Utilities/Disk Utility App on your Mac. Open the Disk Utilities window and select the Mac hard drive icon at the top of the side pane at the left. Then click on the Repair Permissions button. When you have repaired permissions and deleted preferences, restart your computer and launch iMovie. iMovie will replace the .plist file that you deleted. Be sure also that you have sufficient free disk space on your hard drive for iMovie to function correctly. 25GB often is recommended by users of this forum. After doing all of the above, relaunch iMovie and see whether you still have the problem.