If you have messages in eM Client Local folders and you rename the database and then setup a new database to test, “and the new database works ok” with your Gmail accounts, you can then do a partial restore of your Local folder emails either from an eM Client backup.zip file or from you original renamed hidden database folder. See my post below in the following thread.
Removing and re-adding the gmail accounts has not helped.
I should also mention that I have other computers running EMClient that have most of the same accounts configured, running with no problems. Yet.
If your other computers running the same eM Client version with the same accounts have no problems, then either there is a database problem on this specific computer or there is an OS or other external resident problem on this specific computer.
So as removing and readding your Gmail accounts didn’t fix and manually repairing the database also didn’t fix it, then next thing would be to test a new database as I mentioned to see if that is the issue.
If renaming the database and creating a new test one still doesn’t work, then close eM Client and “delete the new hidden database folder” and then “rename the original one back to eM Client again” and reopen eM Client to further troubleshoot it via other options such as the Operations log or Offical support.