Thanks for the advice, guys.
I took the gun to a gunsmith. He took it apart, found nothing wrong, and reassembled it excactly the way I had it. I worked fine!
He said, maybe I had the screws too tight!
I don't know, I think the Italian Colt Gods just had it in for me that day.
I have taken the thing apart a half dozen times without a problem.
Gunsmith charge, $8, so what the hell.