This is my first message in your community and I'm desperate to find an answer. After a long wait of finally getting my hands on Portal 2 for MAC OSX, I started playing today.
Unfortunately, at very random moments and for some unknow reason, I get a menu popping up with 5 choices.
This is a screenshot of it: http://www.facebook.com/photo.php?fbid=10152027190905514&l=f65648e0dc.
None of the options work when selected (unresponsive) and I cannot get rid of that menu unless I quit the game altogether (no keys seem to be assigned to enable/disable it, it doesn't work if I reload a previous game or even if I just exit to the main menu).
It's getting quite frustrating. Would anyone know what to do about it?
