http://bugs.winehq.org/show_bug.cgi?id=31235
--- Comment #4 from mindalot@gmail.com 2012-07-27 21:26:24 CDT --- well, I cleaned out my graphics drivers and installed the latest ATI drivers.. and it resolved my corrupted minimap. Using wine 1.5.9.
At least, it did for the first spectate and private game I made.