Comment 7 for bug 151604

I can confirm this bug in Gutsy, and it seems to be worse in Heron (where the problem starts immediately after login, rather than after a day or two).

This is on three different systems (two desktops and a laptop). No dual screen is involved on any of those machines.

Workaround: Set the panel to autohide.

My guess is that Maximize window vertically starts to believe that autohide is enabled, and sizes the window accordingly.