The fullscreen option had been left as the default since I first launched the game and modified the resolution. Upon launching today (after downloading yesterday's patch), fullscreen is now selected by default again, and it has set my resolution to 1920X1200 so my issue is fixed. Thanks to the team for the quick patch.
After today's patch the game defaults to 640X360 on launch. Upon entering the options menu, the choice to move above 1920X1080 is no longer available. Additionally the option to change the aspect ratio is also grayed out. I'm running a 1920X1200 resolution monitor on a gtx 670, latest drivers. There were no issues prior to this patch. Here is a screenshot of the error: http://imgur.com/ZsMqi. Thanks for taking a look, please let me know if you need more information.