how are you guys modifying the original artwork ?

 As Platty said, the changes make a difference. I *think* changing the order of siblings is fine. Renaming layers and changing the nesting structure is almost certainly going to lose rigging.

This is where auto-tagging is so useful. Use the right names for visemes and who cares if it loses the rigging - it does it all automatically for you. Same true in eyes - get the layer names right, and there is nothing you need to do most of the time.

But if you have triggers, swapsets, or similar, then life is harder. If you change the structure too much you will have to redo it.

For that reason I sometimes suggest starting *all* puppets with a "Standing" layer under the root that only exists in case you want to later decide to add left and right profiles along side it. Otherwise you will lose all the rigging as soon as you want profiles and have to introduce the new layer. You can call it "Frontal" if you prefer, but for Walk it is really the first layer is special, and other layers are Left/Right Profile (unlike Head Turner behavior where Frontal does mean something). They reused the Left/Right profile tags slightly inconsistently in my opinion. Not a big deal, just confusion that could have been avoided. (Too late now - backwards compatibility is more important than fixing this.)

Hi Patrick,

     The safest way is to Right click on your puppet in the Project Window and the bottom section of the menu is "Edit Original".  Click on that and it brings you to your puppet file.

   If a lot of things seem to be going whacky and you have to re-rig, I am not surprised. It has been my experience that after I have rigged a puppet and then make multiple changes I have to re-exame all the rigging. Sometimes CH gets confused as to what you are expecting it to do. Be patient. Be careful.

   I hope this helps. Be well fellow puppeteer.   - Platty