Shopping cart empty when trying to check out as a guest

[SoWhy]

Hi there,

I'm running a shop running VM 2..0.12f on Joomla 2.5.6. When I try to open the shopping cart without being logged in, it will empty itself and show as empty. I can add products and browse but as soon as I try to check out, they are gone. This does not happen when I'm logged in though. Can someone tell me why this happens?

TIA
SoWhy

[jenkinhill]

Is the cart module or a Joomla menu link to cart set to registered user or to public?

url?