Another thread over at steam was posted today regarding the same ./srcds_run: line 357 error:
http://forums.steampowered.com/forums/showthread.php?p=24276664&posted=1#post24276664
Upon comparison, the information displayed there makes it look as though that SSE2 has been dropped so far. I urge anyone having this issue to go over to the steam forums and post about it with what hardware you’re running. The more people post the better chance Valve will fix it.