Entire li element is gone.

[faiscasys]

Customizing a wordpress theme, and having EXTREMELY strange issues. http://dev.epicwebdesign.ca/evandentremont.com/Whenever I try to display a li on the slider, if all of them have background images the entire slider is blank. If one of the li's has no background, it works fine.No PHP or JS errors at all, and when I use chrome's code inspector, the blocks appear to be there, just invisible. I see the ul, and the li, and the sliding if I mouseover it. How can I stop this from happening?\[code\]<li style="display:block; background-image:URL(http://dev.epicwebdesign.ca/evandentremont.com/wp-content/uploads/2013/01/5qqoq5weno_210218126-2.jpg) ; height:300px; webkit-background-size: cover; moz-background-size: cover;o-background-size: cover; background-size: cover; ">\[/code\]http://jsfiddle.net/HZ26M/