I've got an odd bug on one of my machines. It only occurs on the one Mac so it's not a bug in the OS per-se, but it's very annoying and I can't work out how to fix it.
Basically panel windows which are not set to Hide on Deactivate (such as Mail's Activity Window) aren't properly hidden when I hide their parent application. The window remains on-screen but cannot be interacted with.
See a demo here: http://www.youtube.com/watch?v=t9BPCYqpdKI
I suspect that WindowServer has become screwed-up somehow.
How can I restore WindowServer to sanity? Does anyone have any ideas?
Thanks for any help.