I finally got an opportunity to get another look at my Cub. Just as in Parafly's pic, my belt had come off the idler puller. I'm guessing the belt tensioner was able to compensate until the belt warmed up and grew a bit in length. Once the belt was back on the pulley, it was noisy but I was able to mow for an hour and a half without issues. My guess is that the idler pulley bearings are bad. I'll probably replace it and the belt, and make sure the other pulleys and lubed well. Thanks for all the help! Parafly's photo was especially helpful!
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