There's tons of props with a lot of skins so finding one problem might be hard to fix. This can be fixed by changing/removing certain lines on the .vmt that makes the material black when rendering in game. If you can find the specific weapon that you spawned has black texture. Let me know so I can see what's wrong with it.

Plus all packs installed might sometimes makes SFM quite unstable since it's all 4GB's of high quality textures so (rarely) it can be a memory problem as well. You can unsubscribe some pack that are not useful and resubscribe later.

I have noticed a recurring problem across your packs, and it is that some of the weapons have an unexplained all-black texture I'm fairly certain is not intended. Is there any way to fix this?