Dead iTerm2 windows.
iTerm2 2.1.1 @ OS X 10.10.4
When I have multiple open iTerm2 windows and my system crashes, the windows will be reopened when I reboot and open iTerm2 (even in the old size and position) but only one of them will get focus and can be closed, the others are kind of dead.
So I have to kill the one I can get to, and quit iTerm2. After a restart, there is one less window and another one can get the focus.
That has to be iterated over until all windows are gone, then iTerm2 behaves normal again.