After automatically downloading the December 9 update the same problem happens to me. Was working fine 2 days ago and before then, and I haven't changed any settings.
Click ok at the char selection and soma quits. (The enter and tab buttons have stopped working aswell, have to use the mouse now although normal characters still work).
Hope you can fix this soon or post a link to the old version so I can download it and make it so it doesn't auto update.