Hi There, I am not sure if this is exactly the same issue but a client of mind was having the same sort of thing where the back office new form / edit form screen would show momentarily and then go blank.
I fixed this for my client by making the following change in both the nom minified and minified version of lite-connect.js. The problem I was finding was that because the css tag of the <html> tag was getting lost that was causing for it to go white.
--- lite/assets/js/admin/education/lite-connect.js
+++ lite/assets/js/admin/education/lite-connect.js
@@ -420,7 +420,7 @@ WPFormsEducation.liteConnect = window.WPFormsEducation.liteConnect || ( function
root.setAttribute(
'style',
- cssVar + ': ' + ( adminBarHeight ) + 'px!important;'
+ cssVar + ': ' + ( adminBarHeight ) + 'px!important;visibility:visible;'
);
},
