Windows bugs
Over the years I’ve noticed a couple bugs that are present in in some or all of NT/Vista/7. I experience these on a daily basis, across dozens of computers. So it can’t just be me, right?
Focus bug. If the timing is right, some windows remain on top despite clicking on a background window. The background window obtains focus, but does not move to the front. This is typically when the foreground window does some focus changing action (Showing a dialog, opening a new tab, etc.