Running 6.0.495.0 on 3 different OS's right now - Windows XP SP2, Windows 7 and Ubuntu 10.04 (Lucid Lynx)....... the latter of which is quickly becoming my favorite OS.
No problems on any of them and definitely the fastest version of Chrome yet.
Maybe OSX just sucks? LOL.
But I would suggest checking to see if a rogue extension is causing problems. Disable all your extensions and see if the problem goes away. Following that I would make a thread on the Chrome forum and see if anyone can help you out.
Google Chrome Help