My wife is using a MacBook 2GHz Intel Core Duo with 1GB SDRAM running Leopard and iLife 08 to manage photos and edit imported video footage. There seems to be a big problem with iMovie 08. Every time she opens the application and hovers over some video footage to view the preview the screen display mucks up. There seems to be a snow like effect in particular across the application and throughout the menus. I have attached a screen grab of the top menu. The only way to clear this seems to be to reboot the laptop. No other application causes this issue and I have checked the activity monitor and there is still plenty of memory available. As a final check I have imported the video footage into the previous version of iMovie HD on the same laptop and that works fine. Does anyone know why this may be happening and how I could go about resolving it? My only other thought was to re-install iLife 08.