Well, seems that you guys have the same problem that I experienced and mentioned here: http://www.pixelpost.org/forum/showt...?t=7051&page=3
On my site I can only make use of PicLens on thearchive page but not on the common image page.
I guess that it's somehow to do with the template I am using (and also you guys) and the way the appropriated template uses background images.
All other sites I saw where the PicLens addon was working properly didn't have those background images.
But I am not sure if this is really the reason for that missing functionality or not ... just an idea.