re :Thunderbird 145. That means you are using the 'Thunderbird Release' channel as it is currently offering version 145.0 It is the official 'monthly release'. This release is intended for users who want all available new features and bug fixes on a monthly basis.

There is also the 'Thunderbird Extended Support Release' channel currently offering the 140.5.0esr It is the official annual extended support release. This release is intended for users who want all available new features on an annual basis and stability/security fixes on a monthly basis. So you do not get all the new features so quickly, just the security and bug fixes.

That means you have chosen to use a product which offers all the newest features, some you may like, others may not be so important. But it does mean you may be using addons that are not as up to date. After all they are not Thunderbird employees, they are just users like you and me who created an addon and offer it to others who hopefully would offer a donation to help maintain it.

It would be helpful to know if you use any addons and if yes, the name of those addons.

You can find a quick list to copy and paste here:

• Help > TRoubleshooting Information
• scroll down to 'Add-ons' section
• Either post an image or use copy paste to post info.

Have you performed the basic test by restarting Thunderbird in Troubleshoot Mode? If no, then please do this first and then try to drag and drop an attachment to desktop. Please report on results.

I am assuming that you have fully downloaded the email and the attachment. Do you use IMAP or POP account ? Are you using an any addons such as Conversations ?

Thanks for the letter. I'm just a user, updating. I don't know what version it is or what's included, and I shouldn't know anyway. If there's an update, I should probably trust the authors and update it. I tried it in troubleshooting mode, but it didn't improve anything. I don't use IMAP or Conversion. I disabled all add-ons, but nothing changed.