To anyone still struggling with this, I found a solution on a forum that lead me to this link - it's basically Autodesk explaining how to save what skin weights you have and start from scratch then...

Okay so I'm new to rigging but I'm faced with a problem - I can't get Maya to mirror my skin weights correctly. Thing is, I weighted the skin on the Right Side so that might also create an issue.
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Could you be more specific? What kind of character would you like to model (human, animal, etc). Will this be used for animation?
James Taylor (Method JTV on Youtube) is pretty good for character...

When I unlock the normals my shading is completely obliterated. But my normals aren't really locked in the first place; I can still flip them.
For now though it looks like the problem has gone away.

According to the Vertex normals, no. But I did a Merge right before I checked just in case.

So what I ended up doing - which sort of solved the problem - was select the entire mesh's verts, then go to "Mesh Display > Set to Face" to flip the vert's normals. Every time I encountered this...

I'm not super new to Maya but I've never run into this problem before and I'm not sure how to solve it.
I'm modeling a spaceship-car thing. Low poly. But every time I try to Make a Bevel out of a...