I don't know if this will help but after a problem in Order Delivery date, I knew there were a conflit in Javascript

As I use a Jquery Tempklate and Lightbox 1.5 I decide to start from scratch

I install the order delivery date => ok
I install lightbox 1.5 => ok

Now when I install my Jquery Order delivery still work but not lighbox
SO I need investigation on this

Thanks