All HL2 content (or all episodic content, I suppose) is gone from GM all of a sudden. When I try to start a new game (of any game mode), all HL2 and episodic maps are gone from the list entirely, and when I boot up one of my maps for my custom gamemode all of the episodic textures and items are missing (I get error signs and the pink-and-black checkerboards). I made sure that all of the HL games are checked in that content box on the main menu, validated and defragmented, and restarted both steam and my computer. Still missing.
This error came out of nowhere, and apparently I’m the only one getting it. WTH is going on?