Right, The 1st bug is this:
Occasionally my controls corrupt, up and down work, but in reverse, left and right only work when moving back and forward but also in reverse order, but seem to do sidestep rather than turn left and right as they are mapped on my system, i dont think its hardware problems because it works fine when Alt-Tabing into other apps. the work around is changing to 3rd person view (possibly any model visible mode) and moving the mouse then changing back to 1st person.
the other problem is repeatedly falling through the floor, not just falling through the floor once, but apparently falling through the roof of the DR spawn room and dieing from fall damage.
I havent worked out how to stop this but it normally happens 20+ times on each occasion.