A few days ago this started, the shopping cart is always empty. No matter if i'm logged in or not the cart stays empty after adding any items. I have cleared the cache and session folders. Re-indexed and built caches. I don't get any errors in the logs, I don't get any php errors, it just stopped working. The only thing that I can think of is that my hosting company changed my php version from 5.4 to 5.6 without me knowing. However I changed it back to 5.4 and the problem persists. Any ideas?