Hi kjell.ek,
1. Open file "CuteSoft_Client\Gallery\Viewer\LightBox\Code.js"
2. Find section below
this.mask.style.width=de.scrollWidth+"px";
this.mask.style.height=de.scrollHeight+"px";
3. Change to
this.mask.style.width=Math.max(bodywidth,de.scrollWidth)+"px";
this.mask.style.height=Math.max(bodywidth,de.scrollHeight)+"px";
Regards,
ken