Am not allowed to raise issues against HipChat for some reason, so posting this here.
Seeing this using the latest HipChat windows client () running against HipChat cloud.
It sounds like you might have encountered a bug with the Windows client. I'd recommend contacting our support folks at email@example.com and they should be able to point to any existing issues or file a bug with the dev and help collect any pertinent info that might help in tracking down the problem.
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