If I have a problem, how can I find it's cause? I have a very specific problem, but I'm also curious to hear general solutions.
The problem is: sometimes my maximized windows get an additional unclickable top window border. I found out how can I reproduce this issue: I have to hold CTRL and scroll the mouse wheel down (for example when I want to zoom in Firefox, or Gimp), and then Unity gets buggy (also the launcher locks, and won't hide).
I don't want to file a bug until I know what's happening. So my question is, what are the possibilities to track down the cause of this strange behaviour? If you can tell the cause of this specific issue, that's OK, but I'm searching for a method to find it myself next time.