Unable to attach files to emails since 30 Sept update (bug2077590)

Same here. After updating Windows 11 Pro to 26H2 (actually, a clean install), the window for adding an attachment won't open. This applies to both versions 157.0.1 and 153.4.0 ESR.

Three users reported the same issue today in the German Thunderbird forum and one in the French forum. https://www.thunderbird-mail.de/forum/thread/98704-datei-anhang-in-neue-nachricht-nicht-m%C3%B6glich/ Concerns Windows Thunderbird versions since I am unable to reproduce this issue

I just upgraded to 157.0.1 and now I have the same issue, I can't attach any file, nothing happens. I'm on Windows 10.

edit: drag & drop still works

I had some what the same issue https://support.mozilla.org/en-US/questions/1608942 I fixed it my way but I hope mozilla can fix the cause

something a wish I knew when I had the issue was if you needed to send a image another way to do it then attach is menu bar insert > image

A workaround has been posted here: https://bugzilla.mozilla.org/show_bug.cgi?id=2077526

Go to: Settings > General > Config Editor (at the bottom) Then paste 'mail.compose.attach.dir' in the search box and edit the value to an existing folder (for example: C:\)

It worked for me without even restarting Thunderbird :)

I tried the work around as well... but am I going to have to open the advanced setting to get back to the root directory after every file attachment I send?

Can use workaround, but its not very intuitive. When is a proper fix likely Mozilla?