GMOD not recognizing games?

i have team fortress and CS:S installed, but with certain props in toybox mode, it still has that red overlay over the prop saying “you need TF2 to download this!” i know for a fact it is installed too! any help here?

also, i have L4D installed, yet when i try to access the props, they’re almost all errored out. what’s going on here?!

The last L4D update broke a few things

it was before the update that this happened, and i really want this fixed :frowning: