After having cleared out my workshop mods in an attempt to figure out which ones are crashing my game, I get stuck on this loading screen when trying to start up the game. The output log slowly fills up with " HTTP/1.1 410 Gone " as time goes on and nothing else happens.
It seems that user WhiteDwarf has made a similar post to mine but their loading screen is stuck at a different point. Their output log shows the same errors and having those errors show after the game finds a snapshot with invalid data.
I recently tried again, to no avail, and my loading screen has turned into the same thing, with the mod loading screen being the part it's stuck at, same as yours. Just thought I'd give an update from the forum thread I posted.