I don't have particularly good news: tried on a clean Mac Pro and a MBP at WWDC and all working. Also working fine on my test MacBook. Next step is to try to reproduce the issue on more machines but we already tested on one very, very similar to yours.
The only thing I can think of is some machine specific problem with the 64bit kernel, maybe in conjunction with a specific display set up. We do try 64bit but test more the default configuration.
Will keep you updated.
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