Why does the subject line not save in the create template window?

I am trying to create a template to automatically fill in the subject line. The create template window does not save the value I put in.

Hello, what version are you using?

4.0.14479 - says its the latest

Hello,
please download our internal version(to be released in a couple of days) from the following link: http://www.emclient.com/dist/v4.0.149…
It contains fix for this.

Nope. …still doesn’t save it…

Did you try to install the latest version 4.0.15010? If not, please do it.