I just installed version 8 today. I had to Force Quit (on OS X) it twice. What seems to be happening is that if by any chance, you remove a directory (e.g. from the Finder) containing a lot of data indexed by IntelliJ, de-indexing them takes forever (it seems to take seconds for each file). This also happens in the foreground, so effectively you are stuck and can't continue working.
Is this a known issue? Is there a way around it?