Installed the Colorbox, Colorbox Load, Ng Lightbox and Colorbox Inline.
Made myDrupalSite/libraries/colorbox/ and copied plugin files in it. Status report does not complain.
I have disabled javascript and css agregation. I have cleared the cache.
Made colorbox as image formatter for views field. When i click it, it opens as a regular image. No "overlay". It does resize the image according to "image style for content" setting.
my asking for help relates to the reference entry field an autopopulation.
I have a page (e.g. /node/123) with content type A (and many fields). Here the customer can fill out a form which creates another node-entry (e.g. /node/456).