The HipChat for Windows client caches some local data related to automatic logins under %USERPROFILE%\AppData\Local\Atlassian\HipChat\, but there's also authentication and session information stored server-side. There could have been an issue with either side of the connection to interrupt the auto-login.
If you're frequently running into this issue, it might be a good idea to try reinstalling the client in Windows to see if the situation improves.
If not, I would recommend checking with colleagues that are connecting to the same HipChat Group/Server to see if there might be an issue with the server-side; otherwise, I'd look for other potential culprits on your workstation (anti-virus software can sometimes cause odd behavior, for example).
I hope that helps.
Hi Shayne, thanks for the reply.
Might HitChat store data somewhere else?
I quit HipChat, went to the directory you mentioned, deleted "cache" and "QtWebEngine" folders, thinking it might be corrupted data, then launch HipChat again...but it logged right in, without asking for my credential...
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