Comment 80 for bug 103306

After more testing, it seems that the top panel works correctly. On the other hand, if you move the top panel out of the way (say, place it on the left) and maximize a window, the top row of the screen will only accept left clicks. Right- and middle-clicks are eaten and the scroll wheel works as if it was over the desktop.

Confusing behavior, but probably not a paper cut (since it doesn't appear in the default configuration).