Hey Diana –
I have unchecked, then saved, then checked again and saved, to see if that solves the issue. No luck!
The roll over works in the WP Image Zoom admin area, when on the Zoom Settings tab and I roll over the image. That works! Unfortunately, the roll over is not working on my product images.
There are three sites each with their own WordPress Admin using the WP Image Zoom license.
connectracdev.wpengine.com (turned on and activated, but not using yet)
connectracdev.wpengine.com/us/shop/ (turned on and activated, only on product pages)
connectracdev.wpengine.com/ca/shop/ (turned on and activated, only on product pages)