We have been getting reports of this issue affecting GT/S/X 200-series cards post Beta 6. Are your drivers up to date? If they aren't, please let me know.
In addition, pressing ESC will close that message and let you play the Beta.
Hi, Vasadan! I have the same problem. Last time I played yesterday with patch 6 without problems. That means it's not about patch 6 and drivers (I've GF 9600 GT and the latest drivers). Thank you for the help.