In the first puzzle of the custom map "angrybombs", when placing the first cube on the first button, Portal 2 crashes to desktop without error message. I believe Data Execution Prevention is causing the problem, but when I try to put Portal 2 in the list of exceptions, it says this game must run with DEP on. How am i supposed to fix this?

This is REALLY not the place for that. We don't have access to change that map.

You should repost that here: topic3856.html

This also might be of help: http://support.microsoft.com/kb/875352

If still CTD set all your portal 2 visual settings to minimum and try again.