ok, I managed to get it back to the main image using lighbox but the additional images are still using popup.

Now, if I replace the additional images file with the one from the new lightbox I lose the additional images, so whats going on

Everything is new release, Zencart 1.3.8, IH latest release and LB 1.4

I just dont get it.

The additional images all have exactly the same name with _01 and _02 at the end so I figure that part is right?