Shortly after my Win10 x64 ver 22H2 update on tuesday 5/13, my Tbird fails to save any sent message with an attachment to the local sent folder. It is sent correctly and saved with attachment in the IMAP server's sent folder. The same message sent with no attachment will correctly be saved to the local sent folder as it should. In both cases the message "saving to sent folder" is displayed. The TB version was just updated to 128.10.2esr (64-bit) and issue continued as before. PC restarts make no difference. SFC system scan finds no issues. Had no issues with this PC & TB over last 5 years until now. Issue is annoying, since I frequently use the local sent folder to forward messages to additional recepients.