Hi Lars,
This problem is still occurring but as it's so infrequent it's difficult to get an idea of what's triggering it.
I'm running it on a Mac Mini (late 2012), 16GB Ram, with the i7 processor.
Graphics is the built in Intel HD Graphics 4000 1024 MB (small I know but I'm not exactly pushing it).
I have the Gamma window set to Perspective and Live. The only thing I've found is that it doesn't freeze up when you're using it, it seems to do it while you're doing something else and then when you come back to move the view it has frozen.
What I did today was moved the camera view to get a better look at a back truss, then moved the Beta view to bring that truss into view on the CAD view, then hung 6 Parcan bars of 6 on the truss.
Honestly can't work out what we're doing wrong here. The system says everything is up to date.
I have some free time today so gonna have a play with it.
Cheers guys, keep up the good work! :-)