http://bugs.winehq.org/show_bug.cgi?id=12443
--- Comment #4 from Stefan Dösinger stefandoesinger@gmx.at 2009-04-20 14:43:36 --- Multi-monitor handling still is nonexistent in ddraw and d3d8/9. Henri has some hacky patches for Multihead support in d3d9 which enable the multi-head 3D rendering in Supreme Commander. Doing the same for ddraw is an entirely different story though.
I guess some unrelated change changed the random bad behavior into a random good one :-/