I did today. When selecting seats, the site associated $ amounts with Economy+ selections (when typically that wouldn't come up as I get free E+ of course), but I figured it was a glitch and continued. I ended up not going through at the finalizing screen when I saw that it was in fact planning to charge me for the E+ selection and hit back until I got the the selecting flights screen, reselected my flights, and it ended up pricing correctly the second time. Weird.