http://bugs.winehq.org/show_bug.cgi?id=10359
--- Comment #13 from Nick Lawson vektuz@cox.net 2007-12-30 13:47:54 --- This happens to me regardless of compiz/vmware/no-vmware/no-compiz state. And yes, I do have a top bar.
However, with 0.9.52, if I'm NOT running compiz OR vmware (100% native), then the cursor position works correctly, in both the tray menu and the main steam UI.