I will call this a crash since the game becomes unplayable at this point. 

I was playing an online match against an AI when I built Harlemon's Library ( I don't remember the name of the library, but it was something like that, and it took up four tiles). As soon as I clicked a spot to build it the library building icon was deselected and nothing was responsive anymore. I waited around 5 minutes and then I got a message that reconnection was being attempted.

DX DIAG:

http://pastebin.com/HTLahYxa

Debug: Had to split into two parts as the file was very large

PT1: http://elemental1023.blogspot.com/2010/06/debug-pt1-alxander.html

PT2: http://elemental1023.blogspot.com/2010/06/debug-pt2-alxander.html

http://dl.dropbox.com/u/8399358/debug.err

This might be a simple disconnect, but I think it's better to be safe. 

If you have any questions just post them and I will do my best to answer