Users can't open a lay-out preview

Users with restricted ridht can’t open a lay-out preview.

They can select te option to view a preview. A new page opens both the content is not visible, They only see HTML code.
Did I lock some content that they do not have right to see?

Well if the new user can see what’s on the layout in designer then preview should also work.
I don’t want to repeat myself so please have a look at this topic, with this minimal permissions in menu/page security and permissions to specific layout, new user should be able to see preview just fine.