The only way to open after I've unlocked the vehicle is to go inside, reach over and pull back on the unlocking mechanism and force it open, while pulling on the door handle. Obviously same works if the window is down and I pull on the mechanism, and open the door from the outside.

Anyone have any ideas what it could be? I've replaced both the door actuator and the latch assembly a while back. Thanks

 

It's most like that the little plastic piece/sleeve that connects the door lock cable to the door lock lever has broken. It'a an aging plastic thing and most older GS's suffer from.

Remove the door panel and look behind to where you see two cables attaching to the door lock handle assembly. (Not the exterior door handle but the interior one).
At the ends of one or both of the cables you'll notice that they broken/unattached to the rest of the cable.

I wrapped a little chicken wire around it to keep it in place. Well, that's what I'm gonna do when I get bored enough (lol)

Good luck