Hello @gabss ,
If you're needing to insert HTML into your email, we suggest using the custom code editor to build your email.
The new "custom code editor" unfortunately changes the format of HTML templates - it does something to the coding that messes up designs/formatting, etc. And CC just simply didn't care about that as long as they put out something "new" -- terrible overall way to do business
Thank you for the suggestion! I will gladly submit this feedback over to our engineers.