Join the Mozilla’s Test Days event from 9–15 Jan to test the new Firefox address bar on Firefox Beta 135 and get a chance to win Mozilla swag vouchers! 🎁

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

Thunderbird 128.5.2esr Crashes on Launch @ atcuf32.dll | winapi::um::bits::IBackgroundCopyManager::GetJob because of bitdefender

  • 4 replies
  • 0 have this problem
  • Last reply by richbesq

more options

Thunderbird started crashing randomly about 2 days ago, however, after restart, it would remain running if I switched to troubleshooting mode. I removed an add-on from Bitdefender in troubleshooting mode.

Today I can't even open Thunderbird-- it crashes on launch. It won't launch even if I hit the Shift key or if I turn off antivirus.

Here is the most recent submitted crash report:

Crash ID: ⁨bp-b52cd345-636f-445a-ab4c-764ca0250114⁩

Can someone please give me guidance on what is going on and how to fix it?

Thank you.

Thunderbird started crashing randomly about 2 days ago, however, after restart, it would remain running if I switched to troubleshooting mode. I removed an add-on from Bitdefender in troubleshooting mode. Today I can't even open Thunderbird-- it crashes on launch. It won't launch even if I hit the Shift key or if I turn off antivirus. Here is the most recent submitted crash report: Crash ID: ⁨bp-b52cd345-636f-445a-ab4c-764ca0250114⁩ Can someone please give me guidance on what is going on and how to fix it? Thank you.

Modified by Wayne Mery

Chosen solution

Your crash is caused by bitdefender.

Does the crashing stop if you download and install 128.6.0 from https://thunderbird.net/download ?

Read this answer in context 👍 0

All Replies (4)

more options

Chosen Solution

Your crash is caused by bitdefender.

Does the crashing stop if you download and install 128.6.0 from https://thunderbird.net/download ?

Helpful?

more options

"About Thunderbird" says I am running Version 128.6.0esr currently. Should I download it anyway?

Helpful?

more options

I'm on Version: 128.5.2 and get instant crash also.

Helpful?

more options

On further inspection, I was running the 32 bit version of Version 128.6.0 on a Windows 11 system.

I downloaded and installed the 64 bit version, and so far, after 24 hours, no crashes.

Thank you.

Helpful?

Ask a question

You must log in to your account to reply to posts. Please start a new question, if you do not have an account yet.