Crash to Desktop
Every time I play Portal 2, it keeps crashing to the desktop. I'll just be playing a map when it will lock up. Sometimes it will start working again after a few seconds, other times, it will sit for a few seconds, the sound will stop, I get a blank screen, and it takes me to the desktop. No error message or anything. I tried checking the game cache. It found a few missing files that it then re-downloaded, but I am still having crashes. Please help!
continue to verify until it doesn't find any problems
then if you still are crashing check your portal 2 directory for a dump file with a timestamp of your crash and upload it here so I can look at it
Are you on mac? If so this problem has been happening for a few days to all mac users of Portal 2 and Valve does not seem to have fixed it yet.
[spoiler][SP] Alternate[/spoiler]
Are you on mac? If so this problem has been happening for a few days to all mac users of Portal 2 and Valve does not seem to have fixed it yet.
No, I am not on a mac.
Having the same problem as the original poster except for me it always crashes to desktop, also afterwards my Steam application freezes and I have to Alt+F4 it.
will verify gamecache and see if that helps, though i doubt it.
I kept verifying the game cache until it found no errors, but it uninstalled the BEE mod. I just installed it again and it is no longer locking up! 
Mine still crashes even after I verified the game cache... I haven't installed any mods at all.
then if you still are crashing check your portal 2 directory for a dump file with a timestamp of your crash and upload it here so I can look at it
C:Program FilesSteamsteamappscommonPortal 2, I can't seem find any dump file here, what is the name?
It's crashing again! I just verified the game cache yesterday, and I haven't played the game since. Today I got on to edit a co-op map I'm working on when it crashed to the desktop. I tried again and had the same result. HELP!
Is this just on portal 2, or other games? This was happening to me once, and I was able to uninstall and reinstall steam to solve it. Just remember to back up your important files. (Maps, demos, ect.)
It was only Portal 2. Could I just re-install Portal 2, not Steam as well? That would be a lot easier. Also, does Steam Cloud backup your PTI maps? If not, where are they located on the hard drive?