It was a pop-up window. It was happening at first on every Buckeye Planet page, and only in Buckeye Planet, and it would happen 3-4 times per load. I could cancel out of it, but it would pop up a couple more times. That's what led me to believe it was a Buckeye Planet issue. When Deety suggested that others would be mentioning it, I went and talked to IT. The guy said all kinds of computery words that I don't understand, and he got it so that the pop-up quit coming up.
He said that since I use firefox, that should circumvent whatever company "blocks" (my word, not his) that may be in place. But he said that he heard rumblings that they were going to include firefox, as well. He found some window, somewhere (probably in the preferences something-or-other), and he checked a blank box or unchecked a checked box and it's gone. I don't know for how long, though.
Thanks all.