When I attempt to minimize a new message I am composing, everything locks up and the message “not responding” appears. Sometimes it self corrects and reappears, sometimes not, and I have to use Task Manager to kill the job thus losing all the info I had typed up to that point?
If you are not using the latest version of eM Client, you can download and install it from the Release History. See if that helps.
If that does not help, uninstall eM Client, making sure NOT to delete the database directory when asked. That way all your data and settings will still be there later. Then do a fresh download from the Release History and install that again.