Steam Workshop Races Not Showing Up

Races i downloaded a year ago work fine, but any new steam workshop items i subscribe to are not showing up in the actual game. I have tried:

• Restarting Steam
• Uninstalling / Reinstalling GC3.
• Enabling / disabling mods in the options menu.
• Deleting the entire MyGames/GC3Crusade folder.
• Deleting the Prefs.ini file.
• Un/Subscribing to steam workshop items to try to trigger a new download.
• Making sure MyGames/GC3Crusade folder was not write protected.

Items appear to be downloading, but races never appear in the menu when i click New Game.

Is there anything else i can do? I've been trying this for hours for something that should "just work". Getting very frustrated.

thanks in advance.