I noticed one turn that all my units were stuck in a specific motion and when moved did not actually move them from the tile. I was able to initiate a combat with where I thought an enemy unit was, the combat dialog processed but nothing moved. Saved the game and reloaded and I ended up with nothing being displayed on the empty map.
Saved game and debugg.err and dxdiag is here: http://jerome.agadak.net/elemental/Beta3C%5B.92%5D/mapempty/
Unfortunately I did not have the presence of mind to try to screenshot whenever everything was frozen, but heres the "after effects" when I loaded the saved game:
