Same here, camera is going wild. Except in addition to that, my character keeps on running and running, and I can't move left and right, nor backwards, nor stop. I tried unplugging my keyboard, my mouse, restarted the game, the computer, changed the keybinds...Nothing worked. I was just taking screenshots in /gpose.
On the character selection screen, it just instantly goes up (the camera) and keeps on rotating left.