Everything was working fine but today after update I can't get it to working order.
I have the same symptoms but my setup was working fine for a long time so far (2 years already)
I even swapped mouse and it's the same on 3 different mice they used to work previously.

I have run GIMX with Curses and there is difference on the right analog. The same goes with pad testing app on Xbox.
While moving mouse, instead of keep the direction it returns to the center straight away and moves that direction again.