I must say that I I don't know what could be causing this. It sounds like the tokens that we generate for the sidebar contents are somehow expiring or otherwise invalid, but I cannot reproduce that with e.g. Stand-up.
I think your best bet is to contact HipChat Support, maybe they have had similar cases and would be able to help you.
...from the beginning. We have built up a lot of content in HipChat, with it being a core tool in our distributed company model. While it is true that we didn’t need to move to Slack immediately, we felt it...
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