Ultimate Fade In Slideshow v2.0 - some frames freezing & getting stuck "mid-fade"

[Lunar]

Hi

I am hoping someone will be able to help me. I looked through the search but couldn't find this exact problem. I have been updating a slider on a website that another designer created and have been having trouble with some frames freezing and getting stuck "mid-fade" ever since I updated the slider. The only changes I made were: made the slider images smaller (1680x673 changed to 1380 x 550) and changed the following in the index page's Ultimate Fade coding to match:

dimensions: [1380, 550], //width/height of gallery in pixels. Should reflect dimensions of largest image

I also changed the height, width, and left information in the stylesheet to match:

.header {
height: 550px;
width:1380px;
left:59%;
margin-top: -100px;
margin-left:-840px;
z-index:-1000;
position:relative;
}

Other than that, I just exported out new transparent pngs and replaced the old ones. I don't know why any of these small changes would suddenly cause some of the frames to freeze up mid-fade.

Any help appreciated. Thanks

Jamie