Hi,
Sorry, I missed it.
In HikaShop 2.2.2 we added a new way to display images in the product page.
The product page images display has been improved to use a new display method
This new way to display the images comes with a new popup system for the images, it is why HikaShop is now compatible with Shadowbox (there is a new option in the HikaShop backend).
So the way that images are display is now different and it is possible that SigPlus does not handle the images in that new mode.
I do not know SigPlus and I do not know how it works.
But is it possible to re-activate the old mode in the product page, by editing the view "product | show_block_img", you can use the old mode which will be more compatible with SigPlus in your case.
Regards,