I have noticed several times that after updating an application in the Market, the app will never work again. This has happened with Pandora, Key Ring Finder, Audio Manager and countless other apps. With some other apps, after updating the application, it will work fine, but the name will change to something odd like com.chompsms.blabla ... Well, i was reading through Key Ring Finder update and realized that something is occuring specifically with the HTC Hero that is causing this with application updates! But there is a ::drum roll please:: workaround! When updating an app, do not select the 'update' option! This is where the programs become corrupt. Instead, click 'uninstall', then reinstall the application. The freshly installed copy will work perfectly! I think this is the number one reason why Pandora works for some, and doesn't work for others!!!