I'm not sure this works with all versions, but with Media Player 9, just press ctrl-T. That will toggle the repeat. Alternately, go to the menu options at the top and, under the Play menu, there's a Repeat option.
I don't mean to make you feel badly, babe, but that took me 2 seconds to figure out. YMMV.
I don't mean to make you feel badly, babe, but that took me 2 seconds to figure out. YMMV.