I just logged on and now I can't move on any of my characters properly.

I use the standard WASD movement. When holding W to move forward, if I tap A or D instead of the strafe movement it has given me for 2 years now, my character and my view will immediately turn to that direction. This is while mounted and unmounted and so far on every on my account. Moving north, tap D and I am moving East and my camera follows suit. I have not changed any settings or downloaded/installed any addons. Again, this is the first time I have seen something like this.


This is unplayable, particularly in Cyrodiil.