The character leading the party kept falling through the stairs near the ochre jelly encounter at Grymforge today (my party had been in stealth mode).
I tried to reload a couple of times, but to not avail. When I tried to avoid this area by jumping to a point at the end of the stairs, the character did not fall down, but glitched through the ground and would not reappear.
Strangely enough, everything was fine yesterday.