You click on + icon at e-mail or you click [New] in the e-mail overview. Then you are logged out of Carerix (you see the login window).
The reason is that there is not an e-mail template with the code "BLANK".
Install the e-mail template "Blank E-mail" from the template library:
Log in as Administrator;
Go to "Maintenance" - "Templates" - [library];
Search the template "Blank E-mail"
Click on [Install] to install the template;
Log out and log in to use the template.