Anyone else have this issue? We have a multi-site install using Beaver Builder and Themer. In page, when we launch beaver builder, the editor comes up no problem. When we try to fire up the themer header, it doesn’t load.
Which theme are you using? Are you creating the header from sub-sites?
I’m using Builder, theme, and themer. Turns out I just got a response from support. Permalinks reset from custom to plain, back to custom with multiple saves. and bam. Themer editor worked. =)