Hello and Thank You in Advance...

I have been having some difficulties trying to render transparent background images in FFPS. Whatever I try they end up with a black background. I have the "Do not resize source image (upload as is)" option checked when I upload the .png images. I have also cleared my cache. I have searched this forum for solutions, but the only thing that was posted that I have yet to try is a hack for a previous version of FPSS.

I am using:
Joomla! 1.7.3 Stable
JoomlaWorks 'Frontpage SlideShow' Module v3.0.5 for Joomla!

You can see the website in question here:
ultrasoundresources.awebsitepreview.com/

Any help would be greatly appreciated

Bueller.... Bueller... Bueller... anyone???

This is because the slideshow has a background which means you should do some template css modifications...
Go to modules/mod_fpss/tmpl/Uncut/css/template.css.php
and delete this:

#fpssContainer84.fpss-template-uncut {
    background: none repeat scroll 0 0 #000000;
    border: 1px solid #333333;
    font-family: "Trebuchet MS",Trebuchet,Arial,Verdana,sans-serif;
    height: 175px;
    margin: 8px auto;
    overflow: hidden;
    padding: 0;
    position: relative;
    width: 400px;
}

and this:
#fpssContainer84.fpss-template-uncut .slides-wrapper {
    background: none repeat scroll 0 0 #000000;
    float: left;
    height: 175px;
    margin: 0;
    overflow: hidden;
    padding: 0;
    position: relative;
    width: 400px;
}

Thank you Katia....

While I did not have the same exact code as you posted I was able to fish around in the file and make the necessary changes and now have a slideshow with transparent images and no black background showing through.

;)