I had this issue for quite sometime with a SharePoint Online project I was working on. I use Design Manager to create a new layout page and add snippets to the html layout. I would create webpart zones, add my webpart snippets on to the html, save and publish but the resulting aspx page wouldn't have any of my webparts in it. I checked it from SPD 2013 and everything looks perfect, I can see all the code snippets in there. It was really strange and I had no clues. I had some content search webparts in the layout and one content editor webpart with a link to a text file with some css in it. After countless hours on the internet I read about few other people having similar issues when they had custom css on the layout pages to hide quick launch. I tried removing my content editor webpart and everything seems to be normal. A new page created using the layout had all the webparts in it and even the layout preview was displaying fine. I needed this css somewhere on the page and ...
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