" I can however log into other characters just fine" in online mode?

I have the same problem, but with my whole online account.
https://www.reddit.com/r/Wolcen/comments/f7q767/dark_market_bug_back_after_1004/

yea i can log into alts fine in online mode

same problem here since yesterday, crash during an expedition and now black screen everytime when I trying log in with this character

same here... first the checking version bug... now this... was able to play the purchased game 1 day in a week... great... wtf...

OMG SAME THIS SUCKS
Testing see if reinstall work ?!

I have the exact same issue. Started yesterday when i was joining a friends game. I can also hear the sound of my character walking when i click the mouse so its some graphic issue. And it's server side as well, since i can play on my offline character with no problem.

I've tried verifying game cache on steam(didn't find anything), re-installing the game, un-installed graphics driver and installed a fresh new one, updated windows 10, tried running in administrator mode, win 7/8 compability mode,alt-tab x2, fullscreen, windowed, borderless windowed and fullscreen windowed as well. Nothing helps.

nope, don't work - have tried everything a man can try... but it's server side, so no chance to repair it - and devs aren't willing to do anything for the players which can't play...

Same here :(

I found a solution for the dark market.If you have the quality mission running this can be the reason for the game crashes.
You can make a new Char go to town and cancel the mission!