Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Thunderbird not responding

  • 3 replies
  • 1 has this problem
  • 2 views
  • Last reply by christ1

Francesco Lelj
Francesco Lelj
more options

Since some upgrade of W10 and then W11 even the last version of Thunderbird shows "not responding" when download e-mails, irrespective of the e-mail address. From "resource monitor" when looking for the origin of the freezing the threads responsible point to ucrtbase.dll Even sending the e-mail is excruciating slow. Any suggestion? Thanks in advance Francesco

Since some upgrade of W10 and then W11 even the last version of Thunderbird shows "not responding" when download e-mails, irrespective of the e-mail address. From "resource monitor" when looking for the origin of the freezing the threads responsible point to ucrtbase.dll Even sending the e-mail is excruciating slow. Any suggestion? Thanks in advance Francesco

All Replies (3)

christ1
christ1
  • Top 25 Contributor
more options

What is your antivirus software?

Francesco Lelj
Francesco Lelj Question owner
more options

Sophos

christ1
christ1
  • Top 25 Contributor
more options

Try to start Windows 10 in safe mode with networking enabled.

Does the problem go away?

Windows safe mode disables anti-virus software. This is a troubleshooting step, not a solution.