I'm using iMovie HD (6.0.4) to edit clips and burn them as a video disc. It opens up iDVD '08 and is very sluggish. I launched Activity Monitor to see what's wrong, and it turns out that encoderserver and thumbnailserver is not not responding. I tried fixing permissions and deleting the iDVD plist file. Neither one did anything. What do I do? I deleted caches, and also removed the installed themes folder.