Thanks! I will check out the info at the links you provided.
I didn’t actually move WordPress. It was built on a dedicated server at wp.alteca.com. When I was ready to take it live, I pointed the DNS record for alteca.com to the IP address of wp.alteca.com. It seemed to work — my lack of experience with WordPress is showing! Since it’s only having the problem with certain computers, I wouldn’t have associated the problem with moving WordPress.
-Farren