I think I'm getting this problem on both my systems. (Certainly the symptoms are very similar and they're both Intel 945 graphics.) I've switched to the non-themed greeter (SystemSetting/Advanced/LoginManager) and this appears to be sufficient to avoid provoking the problem.
I think I'm getting this problem on both my systems. (Certainly the symptoms are very similar and they're both Intel 945 graphics.) I've switched to the non-themed greeter (SystemSetting/ Advanced/ LoginManager) and this appears to be sufficient to avoid provoking the problem.