Styles broken in template editor


New Member
Faced with broken styles tab in template editor (version 1.5.1).
How we can fix it?
Log in to the backend of your site and click

Extend -> Extensions

Scroll down to Core Extensions and the second option should be "Email Template Builder". Then click the red icon to the side of this option and once disabled click the blue icon to enable it again
still looks the same for me on Chrome and Mozilla...

Do I need to restart anything?

I already logged out and back in and nothing...