In regard to diagnosing the problem, check the console in the client (if the Windows Menu bar is disabled in the client, Ctrl+Shift+F7 will get it open). I’m guessing you’ll see a message about your user not having the required roles.
As of 7.9.4 we started restricting database access in the client, so if my guess is right, this would be a permissions issue. If so then take a look here.