Symptoms
When entering a regular battle the game crashes during the “swirl effect”.
Causes
This is presumeably caused by the game allocating memory poorly, when someone ALT-Tabs out of the game, the memory is saved, when re-entering the memory causes a glitch.
Solution
Eidos has not provided a solution. However, Qhimm.com Forum member dziugo has created a patch that solves this problem. The patch can be found here.