Glad I found this thread.. I was just having the same issue.. I couldnt edit a form and was stumped.. Had WPPageBuilder framework activated, and turning it off fixed it..
I installed the Kirki plugin and that enabled me to access the form editor while WPPageBuilder Framwork was activated, but the form wouldn’t show up in the preview window – instead I got a 404 error in the preview, but the customizer settings did still show, so i guess you could say that’s a half-fix…
Really hoping a solution can be found because both HappyForms and WPPBF are excellent products and I really don’t want to have to forfeit one of them!
<3
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This reply was modified 6 years, 2 months ago by andyfreeland.