Opgelost via
" After looking at the debug code. It appeared that there was a / missing from http:/ after the image src
I found the the file modules\libs\source\file\source.php
I went into the code on line 109 and changed it from
$obj->mainImage = str_replace($subbase."//",$subbase.'/',$baseURI.str_replace("//","/",str_replace( DS,"/",$path.$obj->preview)));
to
$obj->mainImage = str_replace($subbase."//",$subbase.'//',$baseURI.str_replace("//","/",str_replace( DS,"/",$path.$obj->preview)));
The banner started working after that "