Idiot shoping cart
in The Commons
If you add an item to the shoping cart on the site webshop and then log in you can not buy the item.
Item will show up as in cart but your cart will be empty.
Trying stuff like logging out and removing it again or using another browser will not help.

Comments
This is a known frequent problem. The workaround is to add another item to the cart while logged in. Both items will then show up and you can delete the unwanted one.
After logging in...add something to the cart (anything)...and then you should be able to work with the cart items correctly, again...(add/remove/etc).