Comment 1 for bug 159594

I forgot a couple of things that might be diagnostic hints. Since upgrading to Gutsy I have noticed a number of problems that seem to involve the underlying windowing system. The most common symptom is an inability to select a window and bring it to the front with the focus. Usually this involves Firefox, which is the only application that I'm using most of the time. There will be two partially overlapping windows, but when I click on the lower window, it does not come up, though it is scrollable at that point. (I can use the mousewheel to make the contents of the partially covered window move up and down.) When that happens, the workaround I've been using is to switch to another application (usually terminal) and then return to the lower window, and it will come to the front properly.

Probably not related, but from tracking the swap file usage it seems to me that Gutsy is also having worse problems with memory leaks. I don't feel like that's related to the problem I'm reporting here. On the other hand, this machine has quite a bit of RAM so maybe it's having memory problems before it ever gets to swapping. I've mostly been watching the memory leak problems on a different machine--but that one has not yet experienced the white screen of death.