I had the same problem & just fixed it. The Nextgen v0.99 uses a new syntaxis for the slideshow.
I fixed it by activating the nextgen slideshow sidebar widget, then viewing the page source.
<!-- Flash Header -->
<div class="slideshow" id="sbsl27_1"><p>The Flash Player and a browser with Javascript support are needed.</p></div>
<script type="text/javascript" defer="defer">
var sbsl27_1 = {
params : {
wmode : "opaque"},
flashvars : {
file : "https://www.ducked.nl/wp-content/plugins/nextgen-gallery/nggextractXML.php?gid=27",
shownavigation : "false",
overstretch : "fit",
rotatetime : "8",
transition : "flash",
lightcolor : "0xFFFFFF",
width : "358",
height : "158"},
attr : {},
start : function() {
swfobject.embedSWF("https://www.ducked.nl/wp-content/plugins/nextgen-gallery/imagerotator.swf", "sbsl27_1", "358", "158", "7.0.0", false, this.flashvars, this.params , this.attr );
}
}
sbsl27_1.start();
</script>
I believe the sbsl27_1 is a variable which you can alter according to your site.
Try it out! Check out mine @ https://www.ducked.nl
