Just checked, there actually is still lockInfluenceWeight on all the skeletons, but it's not affecting anything and I can duplicate weights, export etc. just fine. I guess it doesn't come into effect unless one of valve's nodes is using it? If it works with a new maya settings folder, but not with your old one, there's…
If you've rigged something from the Dota2 files, you've undoubtedly come across this spawn of Satan. If you don't know what I mean, here's the skinny (from here): From my experience most of the meshes in the Maya files that we get from Valve have this. Some people suggest updating your .fbx plugin to stop this behavior but…