Latest Video Card Compatibility

I had a first LAN party for my game and all the old computers worked great, but the new computer with a Sapphire HD Radeon 7770 would not enter the game world. The HUD came up, but the game world didn't. Oddly, there was no Unity directory in the users/app-data even though the client build was debug, and I can't even see what went wrong. Since I don't have a pro license for that box I also can't debug from the editor.

So my first stop was here to see if anyone knew if there is some kind of DirectX or OpenGL problem going on that would prevent the game world from rendering with this new card. My guess is a backwards compatibility issue with DirectX and the way the new card handles it, but I'm guessing.

Any insights would be appreciated. I looked for a "supported video card" section but didn't see one. I guess what I REALLY want to know is, "should I spend time debugging this or is it something that will resolve itself with a Unity upgrade sometime in the future". I have until February. Should I be worried?