The overlay hooks into the game just fine. I get the little "Access the Steam Community" popup, as well as chat and sign-in notifications. They all pop up within the D3 window itself, so I know this isn't a loading issue. The problem is that the Shift-Tab key combo does not actually open the overlay. To make this even stranger, I know that the overlay is blocking the D3 process from "seeing" me press the key combo, because the cursor does not move between the boxes on the login page. But it just will not open.