Can't spawn any NPCs, they appear as ERRORS. I have Half Life:Source and every other content pack.

Hmm.. I also had that Every NPC was an error.
I uninstalled something, but i can't really remember what it was.

The possesor is bugged, whenever I use it on an npc I don't become the npc, the npc dissapears and I just keep respawning in one place and I cant do anything until I clean up the map

Barney's hat is wireframed.

Human's grunt's headband/helmet is white.

Gargantura's teeth/mouth is white. I see some bad stuff here.

Alien's grunt's armor is all black, not shiny.

And shuld the revolver be all black and not shiny too?

Stachel's charge's front has a wireframe cube.

Tripmine's front laser thing is all black, not blue and shiny.

When tripmine is placed, it has the laser thingy wireframed

Wireframed: Not the mod
Tripmine : Didnt test
Satchel charge : Not the mod (Im not so sure)
Revolver: That isn't on me.
Alien grunt: I am aware of that.
Gargantuar: Didnt test it.
Human grunt : yes i know
Barneys hat isn't wireframed

The Barney doesnt deal damage to anything. But other than that, everything else works for me

And also not sure if glitch but Baby Headcrabs do not either. Both the Barney and Baby Headcrabs only bring down ur suit charge by 1%

Yes, i also think that is the case.