I'm launching Portal through Steam. I was told to enable "access for assistive devices" in universal access and I did. The in-game overlay is enabled in Steam preferences and set to SHIFT+TAB. When I press SHIFT+TAB I get a partial white box flickering in the upper-left corner, but nothing else. When I click on Achievements in the Portal menu (on the title screen of the actual game) I get the message "You must be logged into steam to unlock or view achievements." I am logged into Steam. While this is happening I can navigate through the steam client, view my games, etc. Steam lists me as currently playing Portal. Achievements in Portal aren't unlocking for me or showing in my Steam account. Is this happening to anyone else? Any ideas? EDIT: I restarted and now clicking Achievements in-game shows me a list of achievements, but doesn't show any unlocked even though I know I have completed them. The overlay keys now pause the game, but the overlay doesn't appear (other than the partial white box in the upper-left corner.) Grrr.