In my game I was Tarth and I built my first city near the sand golem. So that was fine and the golem paced back and forth. One turn it disappeared and upon clicking on it's tile it was "still there", just not showing up. A little while later I find I can't end my turn, so I send my queen out and she enters combat with the golem, even though she didn't enter the golem's square. Strange. Anyways, I'll upload the memory dump.
Here is also the debug.err
http://dl.dropbox.com/u/6215079/debug.err