Add product to cart sign in product gone

h i have had some customers complaining about wen they add an item to the cart and then login the product is gone from the cart and they would have to add it again.

has any one had this problem in csc 3.0.4? and is there a fix?

Generally a login recreates the session. The session is where the cart is held. However, this doesn't occur when someone logs in from the checkout page. I would submit it as a bug in the bugtracker with examples of how to recreate.