"Enter Credentials" error
For some reason, after using Thunderbird with no issues for years on my Windows 11 Desktop, I started getting an error message pop-up window, saying "Enter Credentials" but it's a blank browser window, with nowhere to enter anything. Since then I can't receive any e-mail, so I've had to use a different app, but I'd prefer to use Thunderbird. I've tried re-starting the computer, un-installing and re-installing Thunderbird, changing the Firewall settings in Microsoft 11 but NOTHING has worked.
Please help! Thanks, Dave S.