Single Player Crash

I start up Garry’s Mod. It downloads addon updates from the workshop, everything works fine. I join a multiplayer server, it works fine. I start a singleplayer game, it finishes the “Sending Client Info” or whatever it’s Singleplayer version of that is, basically, it finishes loading and crashes to desktop. No errors, nothing, just back to desktop.
Feel free to ask for any extra info that may be useful. By the way, it used to work just fine. So, any tips?

Tried disabling all mods?

I guess that would be a good idea, since it has started recently. I’ll give it a shot.