Hi there and welcome
To remove the master password, please do the following in Thunderbird
Choose Tools -> Error Console, paste the expression:
and press the Evaluate button.
That will open a dialog asking you if you want to reset your password.
With the second problem with the server, click cancel and it should then stop this
If you have any problems, or would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.