In PokerTracker 4 click "Database -> Database Management", click your database then "Rebuild Cache -> Full Cache Rebuild". Be prepared for this to take some time if you have a large database, so you'll want to run it when you're not using PokerTracker 4 for a while). Make sure that your computer does not power itself off or go to sleep while it's running or you will need to run it again from the start. If that doesn't fix it then turn on 'Enable Logging' in PokerTracker 4 via 'Configure -> Options' and then restart PokerTracker 4. Next reproduce the error message and then attach your support bundle to a
Support Ticket where a technician can review your logs and advise accordingly. The support bundle is created via the 'File -> Create Support Bundle' menu option in PokerTracker 4.