We're not exactly sure how all of this works but MetroRadio's login into Pandora is returning an error message. We could pass that off as just a random issue, perhaps a coding bug but we think it's Pandora.
Last night, we received a second unofficial Pandora app (in beta) from another developer. It's a much more polished looking app but alas, we never were able to try it because even that app has the login problem. Normally, not logging into Pandora with a personal accounts bumps you into a anonymous, temporary one so you can stream regardless (you just can't save or personalize)--but even that doesn't work now, making these Pandora apps DOA.
If true, this could set off a mean back and forth between devs and Pandora until the latter relents and you know, just gives us an official app. How hard to we have to poke these guys with a stick before they give us the time of day?
Update: Justin Angel and Den Delimarsky clarify that Pandora did break their own API last night at 2am. Angel has already updated the Metro Pandora SDK to fix this but it will presumably be a few more days before MetroRadio can be fixed. To be clear, this doesn't seem to be Pandora specifically blocking WP users but rather their simply changing their APIs for whatever reason.
Thanks, Kingc513, for the heads up!