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    Hi, we have fixed this issue.

    Go to: appdesignfrontenddefaultyourthemelayoutpage.xml and find this line:

    <block type="checkout/cart_sidebar" name="cart_sidebar" template="checkout/cart/top_sidebar.phtml"/>

    Change this: name="cart_sidebar" to name="cartsidebar" (remove the "_")

    Then go to: appdesignfrontenddefaultyourthemetemplatepagehtmlheader.phtml

    Find this line: <?php echo $this->getChildHtml('cart_sidebar') ?>

    Change: 'cart_sidebar' to 'cartsidebar' (remove the "_")

    Kind regards.-