UTF, you are the grand prize winner. Great call! His (her?) answer reminded me that this gun is the only 1911 I have ever put a buffer pad in. When I got inside I found the remains of the rubber buffer wedged in the guide spring about a half inch in front of the link pin. I thoroughly cleaned and examined the gun (sorry, didn't think to take pics) and found no damage to rails or anything else. I took it to the range yesterday and once again it runs perfectly. Thanks for the replies.
And I'm glad it was a simple fix.
"An armed society is a polite society." Robert A. Heinlein
"After a shooting spree, they always want to take the guns away from the people who didn't do it. I sure as hell wouldn't want to live in a society where the only people allowed guns are the police and the military."
William S. Burroughs