Thank you for using the theme.
Please, provide me the link to your site, so I will able to investigate it via Google Developer panel. Most probably, you modified the theme and due to this fact it occurs.
As regards the empty page after cart adding, there is a PHP error. You need to see the log file of the store and see the certain error and fix it. How to do it please find there:
http://www.zen-cart.com/content.php?124-blank-page
It may occur due to incorrect theme modification wither.
Have you solved other problems?
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