Editing function instablility

I am having issues with the editing function of Nimble Page Builder when used with Customizr Pro.

Sometimes the modules/sections show up and sometimes they don’t. Have tried purging cache, shift-reloading and gone through various troubleshooting angles.

Have looked at some older posts and some say even upgrading to pro version does not solve this issue.

My question is, is this plugin still being supported? and if if is, has there been or can there be a fix for this.

Thanks

The page I need help with: [log in to see the link]