I looked at the capo. Didn't notice any grooves but did notice the capo was not very tight. The rubber bar that presses on the string can be rotated into 4 different positions, each one slight thicker then the previous. I rotated it to the next higher one and.... no problem!!!!!

The capo was not even on my mind as the possible cause before all this.

So, again... what is the 'Strat' (or Cadillac if you are not a Fender fan) of capos?

Thanks everyone!!!!!!

Dave