I don´t use viewports currently.The first two are uninformative (crash somewhere anonymous inside the main game engine), but the third contain useful looking clues. I will have something for you to try later this afternoon (check the SVN thread from time to time).
Meanwhile can you confirm that you are using viewports (or aren't if that is the case)...
BTW, I have more issues with yesterdays SVN as I loose the display of the current unit (and sometimes even more units), looks like a graphics issue.
I am now downloading the newest SVN changes and hope that I can test it in the next hours (but probably not immediately).