Please exit the application, make sure it’s not running anymore then open your Windows explorer and go to %APPDATA%\Roaming. You will see a folder called Mattermost in there. Rename it to Mattermost.old, then start the client again.
You will have to reconfigure your connection profile, but let’s see if that helps. If it does, it probably was related to a broken cache entry in your appdata folder. If it does not fix the problem, we need to dig deeper.
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