After I installed 10.5 on my PB the finder went into beachball mode. My HDs would not show up and the top menu only partialy appeared was was locked up. Apps launched from the dock to some degree. Initially I removed APE, but that did not fix the issue. I later found this thread on the Apple Discussions board which DID fix the issue: http://discussions.apple.com/thread.jspa?messageID=5650727� The basic fix is to rename the DivX folder in /Library/Application Support I was going nuts with this last night, so hopefully this will save some people a lot of aggravation. Once installed, 10.5 rocks! I'm kinda surprised with all the beta releases this and the APE issue were not discussed much before now.