Maya muscle not constraining muscles to joints when mirroring?

[Anonymous]

So after finalizing a muscle which mirrors it to the other side, when I rotate the associated joint the side I was originally working from is constrained properly but the mirrored side's insertion-sided controls rotate freely like it isn't constrained to anything. What could be the problem?

EDIT: Also I should mention that the mirrored muscles come out black, I'm not sure if that's indicative of any problems but just putting it out there.

[lchungUXA2M]

After having the same exact issue for a while. I just realized the fix for the mirroring muscles issue. Hopefully this answer helps others in the future since I couldn't find anything on it either (even in Maya documentations).

The fix:

When putting in your replace terms for left ("_L") or right ("_R"), Maya also needs to detect your joint names. So, if your joints are named "Left_Shoulder_jnt" and you name your muscles, "L_Bicep_musc" and try to replace "L_" with "R_", Maya WILL NOT mirror properly and the muscle flies off. However, if you named your muscle "Left_Bicep_musc" and try to replace "Left_" with "Right_", maya will mirror properly!

TLDR; -Make sure your joint side identifiers and muscle side identifiers are the same (Ex. "Left_Shoulder_jnt", "Left_Bicep_musc")

Hope this helps!