Apple just recently rolled out a version of iTunes that blocked the Palm Pre from syncing with it although that is not what the update states.  There is now an update for iMovie as well that updates stability and other issues.  See Below:

 

 

This update improves overall stability and fixes a number of other minor issues. The issues addressed include:

  • Fixed a problem with incorrect rotation when working with video created by iPhone 3GS
  • Resolved instability when adding multiple beat markers in some languages
  • Corrected an issue where iMovie could become unresponsive after using fine-tuning controls beyond the stabilized portions of a clip

 

The update is recommended for all users of iMovie ’09.

 

You can get the update now via software update