http://bugs.winehq.org/show_bug.cgi?id=7814
--- Comment #19 from Vorobyov Anton phoenix@mail.ru 2008-07-12 02:22:44 --- Here' workaround:
1) Open window with any map (mission description) 2) Toggle HDR on/off
Now you should get all mini-maps in mission descriptions rendered correctly (until next client restart).
This trick makes solar system browser maps render correctly too, but until you refresh its contents (e.g. choose another solar system).