For about a week as I am surfing QB, I get this plain white drop-down box with this message:
Authentication Required
The server
https://client.projects.com443 requires a username and pasword. The server says Restricted.
then there is a space to log in
It only appears for a second, then gone again. As a matter of fact it is so quick that it took many viewings to write down the entire message.
I have not been able to figure out any particular thing that causes the drop-down to appear. I am logged into the board all the time.