Unable to Add Products to Collection from Collection Edit Page

Unable to Add Products to Collection from Collection Edit Page

When I click the “Add products” button, the pop-up window appears, though grayed out, and then promptly disappears.  

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I have the same problem, unable to add product to my collection, nor can I edit the product.  When I try to do anything ,  I get a buffering zazzle thingy and the page turns gray.  here it the link > https://www.zazzle.com/winter_wonderland_with_deer_and_snowflakes_ceramic_ornament-175766065433948472

My problem is that I can add them. But then they don’t show in the collection backend, so I can’t move anything around.  It will show one card or invitation visually, but if you look to the right, it has the ‘count’ correct of 3 or 4. I can only see them on the public end. But again, they are in the wrong order and I cannot move them, because I cannot see them.