I added a product and when I add an amount it goes to the next page and stateds the cart is empty, amounts seem to change in the amounts indicator on the baner but later disappear.

All my other shopping cart items work and I also tried copying one and amending the text etc, overwrote all files on the site to be sure and whilst the item shows it wont add itself to the cart.

As said all other cart items work and its not something I've experienced before...

Add th eproduct and it shows the cart as empty, another item previosuly created works normally