I moved an army to attack an opponent.
As a result, both armies seemed to occupy the same square, and it looked like there was even a third one there. Not clear at all.
I theen ordered my stack to enter city, and game crashed.
debug.err here: http://dl.dropbox.com/u/8046784/debug.err
Sorry, I couldn't locate a crash dump file in the c:\programdata\stardock\... folder.