According to other ppl on twitter its not working for them. I hope sprint didn't block streaming music apps. How did you roll back your apps?
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I have EB13 Froyo 2.2.1 on my Epic like you do. Mine is working without issues. I doubt Sprint is sending streaming media to a dead server like they did on the Evo 3.70 update. Pandora 1.5.4 and Slacker 2.1.170 do not work right on my Evo either, and I didn't do the 3.70 update on my Evo.
I backup previous versions of apps to my card before updating to a new versions. That way, I can back date to a previous version, or older version if the new versions are borked. I discovered that the developers will mess up their apps while trying to fix some other problem.
You can backup any app that is not protected to your card with AppMonster, Astro file manager, My Backup Pro, etc, etc........