John Sanderson

Shapekey mirror and Texture Atlas

I have a mesh that is perfectly symmetrical that I am trying to mirror shape keys on, but it keeps coming up with an error.  For some of the keys, it will target some of the correct, and for some it won't return any.  I can't come up with any reason this should happen, so I am looking for a solution.  The only thing I can think is that I merged it with other objects at one point using texture atlas, but then separated it again.  In the vertex data panel it does still show that it remembers that.  Does anyone know if that affects shape key mirrors?