When I've added a product to my cart and then goes back to the product to add it once more this takes me to the cart but doesn't add the product.

This occurs both when adding a new attribute aswell as adding the previously added attribute to the shopping cart.

Products with no attributes works fine.

Seems to be some problems with sessions since removing the session id from the addressbar makes it possible to add the product/attribute to my cart.

I do not know if this relates to this contrib but I saw the problem after installing it.