http://bugs.winehq.org/show_bug.cgi?id=14456
--- Comment #10 from Julian Lam julian.lam@gmail.com 2009-02-01 12:18:19 --- Yes, Ivan's workaround works properly. This is not a bug, as it is a programmed feature of the game. Within windows, the game minimizes itself, and resumes upon restoration. However, this is not the case on Linux.
Pressing Alt-enter or allowing WINE control over the window manager will "fix" this problem.