So far so good for me, MacBook Air, Mac OSX 10.8.2, PI RC4 plus updates. Thanks Juan, it looks like you extinguished this nasty little critter! I'll test on my iMac later today.
BTW, for Mac users having that intermittent problem with Crash on exit of PI, I got into that loop today trying to apply the updates to RC4. I just restarted my MacBook Air (it had gone without a reboot for several weeks or more) and all was well - no crashes on exit and the updates applied.
Sean