Comment 6 for bug 878627

Everything I know is in the description. All the symptoms are related, and happen *only* when this happens to an application. As you said, it's not specific to Firefox, just that Firefox seems to be the application that triggers it most often. It's *one* issue, with multiple symptoms, that only affects Unity. The spread/scale switcher don't have any issue, nor any other switcher.

About the Alt+grave segfault (4), I think it doesn't happen any more after several unity updates in oneiric-updates, or at least, I haven't noticed it crashing from that scenario.

As for steps to reproduce, as I have mentioned earlier, I have no idea how to trigger this bug. It just happens.