Thank you all for your responses to my dilemma!
To answer one of you, I did not over work the dough. I stopped mixing as it just came together.
I'm thinking maybe the dough wasn't cold enough before I baked it although I did refrigerate it prior to. Perhaps not long enough.
One thing I've never thought about is the fat content. I've always used this recipe without any problem, but haven't blind baked it much. ???
I'll give it a 4th try. Yes, that is right 4th try!!!! Starting with the lengthened refrigeration time.
Thanks Again!

Kupkake