I have USB-Gaming's Portable Fallout 2 installation, with the restoration project installed with your Windows Installer. Also, the resolution patch.
I imagine it's probably got something to do with the Portable Fallout 2. Guess I'll have to go find my CD...
I just got Marcus' metal armour upgrade in Abbey and Marcus has disappeared. He'll still say things to my other party members (Asking Myron to arm wrestle, etc.) and he still gives off a light radius at night, but I can't speak to him and he won't attack or anything.
Any fix for this, or...
I realize I'm late on this.
If your NPC that isn't working becomes involved in a non-player character dialogue encounter, they will begin working again. Vic talking to Valerie in Vault City is an example of this.