This is informational only, I have solved it and hope it might help someone else.
I have a page with a Cycler stack, a Responsive Lightbox stack, and a FreeStack R NavMenu Res1.
The FreeStack R NavMenu Res1 will break the links for the Responsive Lightbox if I put it between the Cycler stack and the Responsive Lightbox stack.
If I put it at the top of the page, it leaves a massive (10 pages) of blank space between the FreeStack R NavMenu Res1 and the Cycler stack.
If I place it at the bottom of the page, everything works just fine.
I’m not sure if this is a ‘feature’ or a bug, but I found it’s best to put it at the bottom of the page.