I tried to reinstall MED 6.873 as well as GS (containing MED 6.872)... Fignya is in two different MEDs... Eeeeeeeeeeeeeeeeeeeeeeeeeee.....................
Mistakes may be here coz my English in not perfect.
MED bones editing and vertex-to-bones assignment didn't work properly in this version (A7.07; fixed in A7.08.1). Workaround: Use the free MED version for editing bones.
I am using Vist x64 and cannot apply vertices it is always greyed out. It is weird I can import an fbx with bones from maya and it works but I cannot alter the bone influence and it brings in extra bones