I was just playing some coop maps tonight, and Portal 2 crashed on me. I wasn't sure of the reason why. Then, after reloading the map and playing again, I realised as soon as I pressed tab for partner view, that caused it to crash. I got 'portal2.exe has stopping working...'

Then you need to just hit 'close program', as you can't do anything else. I accidently pressed it again (force of habbit) and again, it crashed.

Has anyone else experienced this? With all the issues (cubemaps, .vpks etc) since the DLC I figured this is something else they may have messed up.

THE DLC CAUSED THIS (it caused me to not able to use the console or press Esc during split screen)