I've upgraded my M2 CE from 2.1.3 to 2.1.11. Everything seems to be working, but I can't add product to cart. From any location on the website. There's nothing is reports nor log files.
When I click ADD TO CART, it's adding it forever. I get a blank popup where it should say that my product is added to shopping cart, and loader over the shopping cart icon is just hanging in an endless loop.
I've tried several different solutions I've found from people having the same issue, but nothing seem to work.
Please help, this is a huge showstopper for me.