I have the latest play store version (8.7.0) of yatse and today i wanted to add an new custom command (built in function).
When i select + → Add from… → media center the menu opens but is just empty, see this picture: Imgur: The magic of the Internet
It should be like in this picture from the yatse wiki: https://yatse.tv/img/wiki/commands/20.jpg
My clients are kodi 18beta3 (nightly few days before beta4).