Gmod Weapon Mussel Flash Black Squares Problem.

With the latest update most of the weapon mods and the gravity gun have black squares in front of them when I fire them instead of the usual mussel flash.
Also the weapons don’t make a sound when the fire but you can still hear the bullet flying past and the impact of the shot.

I have tried resubscribing to all the mods and I have the counter strike source content need for them, but the problem persists and I have no idea how to fix it.

Thank you for any help.

Do you get any errors in the console?

Verify game cache integrity for GMod. Post console log. Tell us what games/addons you have mounted. What DirectX version are you using and which one is installed. Have you tried updating video drivers?

[editline]6th June 2014[/editline]

Have you tried without any mods or mounted games, just vanilla?