I had this problem with the last stress test as well. The net-7 config tool does not seem to work. E&B always starts at 640 x 480 no matter what I select.
Last time the E&B config tool did work for me, but now its settings wont stick either. I manually looked at results.ini and it has 1920 x 1200 set in there, but the game will not take it.
I'm using windows Vista 32bit and have net-7, client, net-7 config and E&B config set to admin. I have also changed the permissions on the E&B folder so that all users have write access.
Hope I'm not the only one with this problem.