After consistently having issues, now WinXP seems ok, but intermittently causes firefox to lock up.

At one point when loading it would cause explorer to freeze everytime the player was loaded, but that was not reproducible.

I'm not sure its directly related to flash 10 as another test with flash 10 chrome and win7 seems ok. If I figure this out I'll let you know, but it's still an issue with flash 10 64bit beta on fedora 12.