I have the same problem as reported by ekimbo 4 month ago. But I'm using version 1.0.25 of the plugin and WordPress 3.3.2.
Background images from image sets are displayed correctly but when activating any overlay, the page is not rendered. Seems like there is a problem in generating of the stylesheet link. A source code of the page ends before plugin css are "printed" to the page header. I've also tried to deactivate all other pluging, but the behaviour is still the same.
One note: it works great on my computer and this problem appeared after moving on the hosting server.
My comp: php version 5.3.8
Webhosting: php version 5.3.10 (http://s35.station.cz/php/)
This is a really great plugin and 'cause I can't find any similar one, I have to ask for support ;-)