No, haven't changed anything recently.
I've had the Zoom set at 50% for a long time. When this dragging issue began yesterday, I tried resetting the Zoom to different amounts, but it didn't solve the problem.
I'll do some more Windows maintenance, like you suggest, but it was only a couple days ago that I did the Error Check/CheckDisk, and I haven't downloaded/installed any programs since then. Haven't done a virus scan for a while, so I'll do that today, too.
You HAVE been a help today. For Pete's sake, it's Christmas Day (we bumped all our festivities up one day, so it seems like the 26th to us), and there you are brainstorming away to try to figure this nutty problem out for me. I really, really appreciate it.
I've got an email ready to go out to Thom tomorrow if the routine maintenance doesn't help. Thanks very much.