When I click the button to open the Database Connection Configuration, nothing happens, it seems like something opens (without any window appearing) and it only allows me to interact with Bartender if I press the ESC key. If I create a new label, it doesn't work either. In other words, it doesn't work with any existing template I have, or with a new label.

I also tried this but it didn't change the behavior:

"You could try to close BarTender, open the Windows registry key ("Start > Run" then type regedit) and now remove the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Seagull Scientific
HKEY_CURRENT_USER\Software\Seagull Scientific
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Seagull Scientific (for 64 bit)

Another suggestion would be to open the Windows control panel, add to the "Add / Remove Programs" dialog, and choose to repair the BT installation (or remove and reinstall BT completely)."

Any suggestions?