[Half-Life: Absolute Zero Maps] Couldn't include file 'az_shared.lua' - File not found (@lua/hl1coop/maps/az_01.lua (line 1))
1. unknown - lua/hl1coop/maps/az_01.lua:1
2. include - [C]:-1
3. unknown - gamemodes/hl1coop/gamemode/shared.lua:31
4. include - [C]:-1
5. unknown - gamemodes/hl1coop/gamemode/cl_init.lua:22

Happens when starting any of the maps in co-op. Causes all AZ-specific co-op rules to not apply (such as the alterations to the menus, and occasionally HUD). Crashes also seem to happen quite often. Doesn't seem to happen when starting the maps in singleplayer, but when starting with 2+ players, issues arise. Tried with only the linked collection, as well as with a factory-reset GMod. No dice. Didn't happen before, only started happening recently. I'm on the x86-64 beta branch. Haven't tested it with the normal branch, yet, but I have no reason to believe it'd work. On the drive I've installed GMod on, I still have 193GB of free space.