Magento 2.1.11 add to cart not working

[BaracudaDXB]

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.

Thank you.

Cheers,
Nemanja.

[Damian Culotta]

Hi @BaracudaDXB,

You said no messages on logs. What about the ajax call? Can you check your browser console at the same moment you're clicking on add to cart?

[BaracudaDXB]

Hi @Damian Culotta,

Issues required way too deep digging, and time, which wasn't planned at all. So the upgrade is revoked, for the time being.

Thanks.

Regards,
Nemanja.