Just started up the client tonight after playing without issue earlier. It goes from the launcher to the client as normal. Displays the Cryptic logo for a split second (before the loading bar would usually show up) and then just turns black.
The mouse is still present, it loads and logs in, and the music plays. I move the mouse around and can hear the UI beeping as normal when the mouse runs over it. But everything is black.
Nvidia GTX 560 Ti. Latest release drivers. Was working fine earlier and nothing changed.