Ticket List Empty (multiple errors) after upgrading to 4.73.1

Normal update process like before, go to Staff CP and ticket list is empty. Tried clearing the cache both from the admin and server directly, same problems, multiple errors showing in the Admin:

PHP
10 March 2016 06:26 PM (
8s
)Router: https://helpdesk.nc-software.com/staff/Tickets/Manage/Index
Undefined index: _staffEmail (D:/Webs/kayako/__swift/cache/12f8ed3433e05ce4867030df434658bd.php:15)
PHP
10 March 2016 06:26 PM (
8s
)Router:...

Ticket List Empty (multiple errors) after upgrading to 4.73.1