hi i am having the same problems at sscorpio too after i upgraded to 3.8.14.1, from 3.8.9.5.
Upon upgrade to wp ecommerce 3.8.14.1, i am unable to add any product to the cart. Whenever i add any product, on the checkout page, it just shows “Oops, there is nothing in your cart.”
In need of urgent help, very much appreciate the help in advance!
Meanwhile, do you think i should rollback to 3.8.9.5 which worked fine, using ftp to replace the files?