Your info helped us to get our Pandora app to finally launch! We have had the exact same problems with our Pandora app. We recently purchased the Samsung LN55C650. All other internet apps worked fine but Pandora. I upgraded to a paid Pandora account because I use it so much and was highly disappointed that it wouldn't work. After troubleshooting it with a support rep from Pandora, I am now even far more disappointed. To begin with, this guy actually told me when I first emailed in about the problem and this is a quote "We don't have other Internet@TV users writing in with problems." Wow, what a great way to make a customer immediately feel that the problem is on their end. I had been troubleshooting with Pandora for 5 days now and after upgrading the software version for our TV this morning (at his suggestion), it still would not work. The device activation code registration process on Pandora's website did not work. The rep admitted after multiple attempts that he did not see any device activation code associated with my account. I complained about the fact that the registration process leads you to believe that it worked fine and that is a problem on their end. There was no acknowledgement or explanation on that problem. He even entered a device activation code manually to my account and it still wouldn't work. So this morning, we finally turned to the web to resolve this ourselves and found a link to your post in the Samsung cnet forum. We also deleted the Pandora app and then added it back in. Launched the app, got yet another activation code. This time, we left this screen up on the TV (rather than exiting out of it which may have been part of the problem in hindsight) and went online to Pandora's site to register the code. After that was done, we exited out of the device activation code screen and then tried relaunching the Pandora app again. Yay! It finally worked! But as you said, we still cannot log in to the app using my Internet@TV account which I had linked to my Pandora account info. It still says "Cannot login" "Invalid user-id and/or password". Pandora clearly has issues with their app on the Samsung TVs and the level of knowledge and help to get it resolved from Pandora was very disappointing. After resolving our problem thanks to your info, I emailed the support rep I was dealing with and gave him an honest assessment on how I feel about the Pandora app problems on Samsung TVs and on the customer support I received, particularly regarding his statement "We don't have other Internet@TV users writing in with problems." Thanks again for posting your experience in this forum, it certainly helped us after 5 days of troubleshooting frustration!