Gradient when hovering mouse over image links

[dmann633]

A few weeks ago, I noticed a gradient and white rectangle appear on top of my circular links (images) when hovering the mouse over them. Is there a way to remove this?

[#2]

Same question here but I guess there is none. Also there should be an option to choose wich image you would like to appear as a lightbox or not. Now each image on a page shows as a lightbox image.