When using the slow follow focus (left/right) the camera crashes. The fast one (forward/back) works fine.
With Enable Beeps the camera shuts down and on reboot shows: "Camera was not shut down cleanly. Skipping module loading".
When disabling beeps the camera shows "focus error :(" and locks up. I had to remove battery to regain control.
The bug occurs with raw_rec, mlv_rec and without any modules. Both in stills and movie mode. Nightly 2014-02-12 (2f8e1791894), 40mm Pancake.