Hello, @RicardoE105
Based on experience, the issue could (potentially) be related to mixed collations in the database but before confirming on that, can you please increase the file log level to DEBUG and reproduce the issue while tailing the mattermost.log?
We are looking for error something that looks like this - Unable to update the last viewed at time. We can then dig into the issue based on the error detail shown.
Side note, can you please confirm if you have the experimental sidebar enabled?
