http://bugs.winehq.org/show_bug.cgi?id=11294
--- Comment #2 from Dmitry Timoshkov dmitry@codeweavers.com 2008-03-05 04:18:22 --- That happens because we don't report a proper workspace top coordinate to take into account the top panel of the WM (Gnome in my case).
Can you reproduce this if you turn off/hide the top WM panel?