Forget Password link not loading layout and template page.
This problem appears on themes after SUPEE-6788
Go to app/design/your/theme/layout/customer.xml
And replace
customer_account_resetpassword
With
customer_account_changeforgotten
Alternative way is backup and remove the customer.xml to let magento uses its base xml.
Please check also register and newsletter subscribe form that works properly. Do a research what you have to check after this patch to avoid further inconvenience in the future.
#if (isset($_SERVER['MAGE_IS_DEVELOPER_MODE'])) {
Mage::setIsDeveloperMode(true);
#}
ini_set('display_errors', 1);
This should show any errors your having on the page, alternatively, check your log files, var/logs/system.log and var/log/exception.log. Paste the error onto your question. – JoshCarter Sep 19 '16 at 13:15