MacBookPro, 1G RAM, OSX 10.4.6, XP SP2, BETA5 Had a perfectly running config. Relaunched PW and clicked start to load. Windows did not complete loading and got an PW error about not being able to allocate physical memory. Hit the Start button again and Windows started loading, then loaded the CheckDisk countdown. Once the countdown completed to actually run the check disk, PW spontaeously rebooted my MBP. When I restarted the computer, all my preferences were shot for Finder, finder windows, Safari, etc. Any App that was running at that time had it's preferences files completely blown away. I hate to say it, but this release is by far the buggiest that I've encountered.