My game was doing the exact same thing yesterday. After another small download came on the launcher last night, I now get this message before it kicks me to the desktop: "Cannot Display This Video Mode Optimum Resolution 1440 x 900 60 Hz". This is what my system is set to, but I still get the message and the game will not play.
I called support about it, and after waiting to speak to someone that did not seem to understand my issue, he told me I could not be helped over the phone and had me e-mail him my information. That was more than twelve hours ago and I have not yet received any response.