As I wrote, importing pictures from my iPhoto (9.5.1) library into iMovie (10.0.2) on my iMac (late 2007 with Maverick), results in a weird bheaviour of the screen, it freezes and the only way to get out of it is to log out and in again. I've tried the following:
Repair permissions (my iPhoto library is on an external HD)
Uninstall and reinstall both softwares
Move the pictures I need in a different folder
None of that worked, I'm thinking to switch back to iMovie 09. Any help?