ah, read the bug too fast, I though it was hanging due to the gif you attached. Could you run rhythmbox -d and note what's it doing when hanging? It's likely it's chocking on some file stored on your disk (like that gif file you attached to the bug)
** Changed in: rhythmbox (Ubuntu)
Status: Rejected => Needs Info
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Rhythmbox hang during launch
https://launchpad.net/bugs/71208
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