Every since the beta i've been getting lots of exceptions; many per hour!. Some requiring restarts to re-build IntelliJ data. Almost as if a bunch of stuff was tossed into the Beta at the last minute ;)
However 5646 has been most pleasantly stable for me! I ran about 4 hours on Windows and another 4 hours on the PowerMac. Not a single exception!
Develop with Pleasure has returned!