Downloaded things not showing up in-game

I recently started up Garry’s Mod, only to find that all of the things I’ve downloaded (maps, models, etc.) are not there. All of the files are present in their correct folders (they were working fine a week ago), but they just don’t appear in the actual game. Is this a common problem, or am I just a moron that screwed something up?

Thanks.

Try copying the files again? o.O
that’s what i do and it works… sometimes

I tried that already. Multiple times, in fact. No dice.

Oh… well I don’t really have any other ideas so… sorry D: