Magento ver. 22.214.171.124, site is coolvape.co.uk
As far as I can tell all simple products will work fine however when a customer tries to add a configurable product to cart they just get a loading icon. I can't think of any changes that were made at the time it started occurring, it was working fine until a few days ago. I've tried clearing the cache and reindexing.
If I disable Ajax for Add to Cart, you get directed to another url (e.g. /checkout/cart/add/uenc/aHR0cDovL2Nvb2x2YXBlLmNvLnVrL2dlbmVyYWwtY3VzdGFyZC5odG1s/product/1650/form_key/OAXh9Lk7RduomSs5/) which doesn't load, saying Unable to load the web page because the server sent no data.
1650 is the ID of the cofigurable product, if I change it to an ID (e.g. 1653) of a simple product associated with that configurable product it will direct me to cart with that simple product added but no thumbnail and the text badly formatted.