Previously sent attachments are added to new messages
Since upgrade to 38.2, whenever I want to forward a message, if I had forwarded a previous message with attachments, the new message contains the attachments and sometimes even the email addresses from the old message. In the attached image, I forwarded a message with Excel file, but two other images and two message parts from previous forwards were added.
Wšykne wótegrona (2)
It's even worse... When creating new message, not only when forwarding, previous recipients and attachments are added to the new message.
see https://support.mozilla.org/en-US/kb/safe-mode Please tell us what happens if you start Thunderbird in safe mode?