shape keys not copying

I’ve been working with right/left side of the face in shape keys making the character smile, etc. I make the character smile on both sides of the face in one key, then assign it to the right and left side. It had been working fine for quite a while, but all of the sudden, I can’t get it to copy they key.
For instance, I go into edit mode, make the face to the expression how I want it, go to object mode, set the value to 1, press add shape key, and it doesn’t copy the expression, it just copies the basis. Is there something I hit to make it stop copying the key?

press add shape key,
Ue the ‘New Shape from Mix’ option
http://screencast.com/t/7COEhDrIwnK

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sweet. Thanks a lot! :smiley: