conflicts with latest release

hi guys!
i’ve some conflicts on the latest release of wordpress & your plugin

watch my site

http://www.michelemarri.me/main/

with the plugin activated i can’t see the main content.
It’s there buy invisible. if u try to drag it with the mouse u can see it.

Can you help me figure out why?

thanks in advance

mike

http://ww.wp.xz.cn/extend/plugins/site-background-slider/