Hello,
ShopSite® Pro 14.0 r3 Running into an issue using IE 11 product does not "Add to Cart" as well as view cart link does not work. I've tried on multiple computers and none worked with default browser settings nor could I update/tweak settings to work. CJ template for pages. CJ Side Accordion for products. Site is under development however you can test it yourself at: https://www.home-tropics.com/Decorative-Mailbox-Post-Seahorse.html
Knowledgebase/announcement mentioned ShopSite v14.0 r3 Maintenance Release "fixes an issue with CJ-based themes where in Internet Explorer 11 the Checkout button can be off the right side of the screen." however this is a different issue.
Is this a known bug? IE 11 still has roughly 7% browser market share.