Pandora plugin will not play music on ATV2

Hi - first, let me say I am not a very technical user. I have XBMC on a jailbroken ATV2. I followed instructions to install the Pandora plugin. It was working initially but now I am unable to get any of my stations to play. I press the play or select button and nothing happens. I have version 1.2.9 installed. I was wondering if I should try to reinstall it or if there is a new version. However when I try to uninstall from the Add-On manager, the uninstall option is greyed out.

Any recommendations would be very much appreciated.

Thanks.

:confused2:

I had that on the default setting of mp3-hifi, but changing to mp3 or aacplus fixed it for me.