I checked and the images in a lot of cases are being pulled from the bmz_cache so image handler is taking care of them. I wonder if in some cases the images you have in the large folder with the _LRG on them are overriding image handler functions (which is how you override IH2).
as a side note your dynamic currency converter doesn't always work for everyone. I have yet to get it to finish loading, which means I never get the light box on the large images.