I think it has something to do with AI and repair ...
To reproduce the error do the following:
Start a game with map conflict:
you: slot1 egypt
cpu: slot2 tech
just repair your sphinx and wait and you will see something like this:
[2011-05-01 16:36:06] *ERROR* In [game.cpp::update Line: 920] Error [arrayIndex >= getCellArraySize(), arrayIndex = 16472 w = 128 h = 128]