I did setup my account under the plugin settings/Pandora settings tab and I installed the Pandora skin at the initial install and then again from the install additional plugins under all programs/OpenMobile.
I have no option for a radio button or tuner button and no video option either.
I know other frontends in the past will not install files for hardware that's not found such as a radio tuner or GPS device not sure in this case if that could cause a problem.
I uninstalled OM and removed the openmobile folder from programfiles rebooted and reinstalled when I went to configure it again all of my setting were saved.
Your uninstaller doesn't remove the registry settings or application data setting or something of that nature.