Having problems with TF2 content

Ever since the TF2 SteamPipe conversion, I’ve been unable to use the models from TF2. This is especially infuriating now that a new update is out, because I want to play with the new models. Strangely, I am able to access custom/modded content, such as Vs. Saxton Hale or Advanced weaponizer. Can anyone help me out?

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