Views - Preview is broke

Go to views.
Add image and look in preview.

Line 82 in fractionslider.css

.fraction-slider .slide {
display: none;
width: 100%;
height: 100%;
position: absolute;
z-index: 5000; /* Line 82: This creating issue in admin page when editing View - preview overlap other screen*/
}

More change needed to fix preview.

Why critical? Because isn't possible to use slider when it is in background (slider overlap ALL admin page when it's on background)