The Muscle menu includes an item for disconnecting muscles from the deformer. Using this option to disconnect muscles lets the plug-in zero out weights for the muscle or bones that have been disconnected. If you have deleted or disconnected a bone or muscle without using this menu item, the internal weighting and indexing of the deformer can be disrupted.

To fix improperly disconnected muscles

1. Select the mesh that has a Muscle deformer applied with Sticky weights to muscles.
2. Select Muscle > Skin Setup > Auto-Fix Deleted/Missing Muscles from the main menu bar.

   The mesh is checked, and the internal indexing is corrected. Weighting is not adjusted in any way.