Rigging issue - mirror envelopes

LeeMeredith

Hello I'm having an issue where when I try to paste blue to green verts or even vice versa for that matter it deforms horribly.

I get this result when I move the left arm control and the right has no effect, the bones go through the skin with no affect on the mesh :-



I've centered the pivot of the character, reset xform and reapplied the skin modifier (loaded up envelopes)

When I click on the side I've refined, it shows up enveloped correctly on both sides like this :-



But if I click the opposite side envelope is displays no weights.



Anyone have any advice? thanks

Xolo

I have this problem every other model or so. For me tossing away the skin modifier and starting over tends to fix it.