I recently replayed the GOG version of Dreamfall, to get ready for Dreamfall Chapters, and I found an annoying bug in the WATI Corp building. After speaking to Damien, Zoe goes through the door to begin the descent down to the bottom level. However, she gets stuck in the doorway. I left it for a while in hopes that it would work itself out, but it didn't.
So I went to the load menu and clicked a previous saved game to load up, and was asked if I was sure I wanted to load. A bit apprehensive, I clicked cancel, which went back to the game and suddenly Zoe went through the doorway!

Damien then followed and again got stuck. I tried the same method of clicking an old saved game to load up and then choosing cancel, and he too suddenly became unstuck.

I found this worked in other areas where some NPC's got stuck on corners or doorways.

Sorry if this has been mentioned before... hope it helps.

I used a different work-around.

When Zoe gets stuck in the doorway, go to the game menu without exiting the game, and change the video resolution (example: from 1920x1080 to 1024x768 - don't forget to APPLY the settings), and then simply resume the game. This should result in Zoe successfully walking through the door.

Of course then Damien got stuck too right after that, so I did the same thing as before, changed my resolution again (back to 1920x1080) and Damien got through the door fine once I resumed.

I encountered this problem a few minutes ago. I solved it by going to the options screen and changing the mouse selection from movement (my default) to camera.

Once I had saved the settings and return to the game Zoe moved forward. The second character become stuck and I entered the options menu, changed the mouse selection to movement, saved the settings and return to the game.

The second character was moving freely and my default settings were restored.

It may be that just going to the options screen was sufficient by itself. My previous save is too far back for me to backtrack and check.

Ironically I solved this problem by looking for an answer here. I (ALT/TAB'd) out of the game to look for answers and when I Tabbed back into the game the characters had moved past the glitch. this worked twice in sticky spots in the game. :)