Is the spinner consistently displayed, even between restarts of the client? If so, it's possible that you're encountering some kind of bug in the client itself. It looks like the list itself is loaded, but the spinner is just not going away. I would suggest checking the web client (https://hipchat.com/chat) to see if encounters the same issue or not.
If the problem persists, please contact us at support@hipchat.com and the team can help get down to the root of the issue. Thanks for letting us know about it!
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