Comment 30 for bug 916568

Ok thanks, that second video shows the problem quite clearly.

It really does feel more like a window manager bug than X, however the fact that you find similar focus problems in both gnome shell and unity tends to suggest otherwise.

I haven't seen other reports of this behavior (or, at least, not any that I can recall). Is there any chance it is something particular to your system configuration? Can you create a USB live image and boot that, and see if it reproduces? If it does not, then boot your regular system but log in as a guest account.