Real quick question, what would cause the mirror bones to entirely skip the left arm cp weighting?
Bones mirrored but the weights didn't

Most likely something stupid I did as usual.

Thanks in advance

CP tolerance too low?

I'll check that, maybe the arm is out of place a hair and I didn't notice it.
Thanks

You were right Robcat, thanks a ton, knew it was something simple.

figured out an easy way to get things to be symetrical groups are slightly off. I made my selection on the correct side, dragged a guide line to the center of that group then double clicked on it to bring up it's location and deleted the (-) in front of the x axis coordinate. This placed it exactly the same distance in the positive x and gave me something to align the other group to.