Whoops! Your session has expired.

To be more precise the message the customer gets is: "Whoops! Sorry, but you are not allowed to perform the action requested"

I have the same problem. The last time a product was removed from the shopping cart, then a new one was added. Has anybody else noticed that correlation?

Same issue here. Fresh install, no addons at all. When user tries to add an item to the cart. I have only moneyorder and freecharger payment set up. I don't have ssl enabled yet.

Okay it's doing it again... I try to buy my testor product click confirm to checkout after putting my CC info
and get Whoops! Your session has expired.

The auto receipt sends so I was charged, but no order goes through, which means you check out again and get double charged