Go to Control Panel | Music | Pandora Radio | GO TO
Pandora loads.
Select a station if you want, but I don't think it matters. Then press the Options button in the upper right hand corner.
You'll be presented with a "Manage your Station" dialog, with 4 options listed below and a "Close" tab in the upper right hand corner of the screen.
Tapping "Close" doesn't do anything . . . and I think it should. If there's some other way to back out of that screen, I can't figure it out.
It's not a "dead" area on the display, since other widgets respond to screen taps in that area. In fact, the above-mentioned Options button is in roughly the same area and works fine.
There's a similar "Close" tab on the ratings panel that pops up when you tap on the album art. Same result . . . doesn't close the ratings panel. Pressing any of the buttons besides "Why Play This" gets you out. It does appear to exit the panel at the start of the next song, though. Not sure what would happen if the song was paused . . . my guess is a reboot would be in the offing.
Also: I think the logic of the Pause/Play button on the main Pandora display is reversed. In other words, the Play icon ( |> ) should be dimmed when music is playing, and the Pause icon ( || ) should be dimmed when the music is paused. Currently, it's the opposite.