e mail been working fine for several months now. Today while writing new mail the new letter disappeared and an old one replaced it. New Mail will not stay on screen now and it jumps almost immediately back to the part written message in Inbox. Cannot continue writing, nor copy the inbox file. Was able to Send the part written file to myself.

Hi David, not completely sure what you’re referring to, can you maybe make a screenshot of the issue?
What version of eM Client are you currently using on your computer, can you please check for the exact version number in Help > About?

What mail service are you using with eM client?

Thank you,