This has started with the latest beta version Beta 2-B. I did not have this type of issue with the previous 2 beta versions.
It has occurred twice this morning. The 1st time I was about turn 30 (guess) and I was zooming in/out. The 2nd time (the one with links to files) I was early in game around turn 15 and I just clicked to move.
Files: http://dl.dropbox.com/u/8495437/Crash/Crash%201.zip
Included in zip. "debug.err", "DxDiag.txt", "Elemental0_804-2010-06-26T10-13-54-272.zip"
I will further update this if I can be more specific as to the cause.