FYI: Almost every time I get a prompt to do a shutdown (with or witout an an automatic restart), i find that IDEA is not shutting down. A small, 760K process named i4jdel0.exe is started, but the main IDEA process continues running. I just invalidated the caches via the File menu option, and was asked if I wanted to shutdown. After more than 5 minutes, IDEA is still running. The same thing happened after a plug-in install prompted me for a restart.
(Am running under Windows XP Pro SP2, 3.5GB RAM, IDEA 10762)