First of all, great plugin... thank you!
There seems to be an incompatible issue with Issuu or Issuu PDF Snyc.
When lightbox is activated, the Issuu PDF reader disappears.
Example of a post: http://woktoss.com/?p=15093
Click on the "[enlarge infographic]" ovarian cancer image near the bottom right of the page, and the previously loaded PDF above will disappear.
It would be great to keep both plugins activated.