Problem in IE8

[Johang]

I installed VM 2.0.0-RC-2k in Joomla 1.7.2.
Everything confugured incl. shipping and payment and everything works fine except the next.
When I complete the order procedure or when I empty the cart and after that via the menu return to the shop it's impossible to add anything to the cart.
I have this problem only in IE8, in Firefox everything works fine.
My site is running under WAMP on localhost.