Did you double check the update_product.php file make sure you did not overwrite core code or misplaced the connector before the proper variable? This is usually the most common problem for white pages for adding or updating products.
Make sure you have the connector variables between the following lines not before or after
//// INSERT PRODUCT-TYPE-SPECIFIC *INSERTS* HERE //////
//// *END OF PRODUCT-TYPE-SPECIFIC INSERTS* ////////



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