Magento post upgrade - compatibility issue fix -- 2

Work list. 1. Fix compatibility issue of call for price. [login to view URL] After upgrading from 1.6.2 to 1.9.2. Call for price button no longer working and Add to cart button no longer working. Call for price and add to cart should work in search page, category page, and product detail page, Call for price menu should also work in admin panel. 2015-07-19T12:36:58+00:00 ERR (3): Warning: include(): Filename cannot be empty in magento/app/code/core/Mage/Core/Block/[login to view URL] on line 241 2015-07- 19T12:36:58+00:00 ERR (3): Warning: include(): Filename cannot be empty in magento/app/code/core/Mage/Core/Block/[login to view URL] on line 241 2015-07-19T12:36:58+00:00 ERR (3): Warning: include(): Failed opening '' for inclusion (include_path='magento/app/code/local:magento/app/code/community:magento/app/code/core:magento/lib:.:/opt/remi/php55/root/usr/share/pear:/opt/remi/php55/root/usr/share/ php:/usr/share/pear:/usr/share/php') in magento/app/code/core/Mage/Core/Block/[login to view URL] on line 241 2. Cannot add to cart, always show as "Shopping Cart is Empty" after click on add to cart button 3. PDF invoices and packing slip can be printed, but the payment method section is not showing correctly. 4. In the [login to view URL] file 2015-07-19T12:36:41+00:00 ERR (3): User Notice: 'hashed_directory_umask' is deprecated -> please use 'hashed_directory_perm' instead in /magento/lib/Zend/Cache/Backend/[login to view URL] on line 143 This error should be fixed. Required: 1. No core code change 2. all fix requires record of back up of original files that was changed