^I was unable to play in fullscreen at 1920x1080 during Phase 1. To play in 1920x1080 I had to use Window Mode.
It took a day or two for Support to respond to my ticket - when they did they asked what graphics card I was running. I informed Support I have an eVGA GTX 560 Ti. They responded with something to the effect of they will be expanding their supported graphics cards.
Once Phase 2 rolled out, I was able to play in 1920x1080 in fullscreen. So, give them a chance...GRO is still just a Beta.