The definition Update is being blocked on your site by a firewall plugin that is setup to redirect you to your home page if you try and post any Hexadecimal values. Just deactivate the firewall plugin to do the update or add your IP address to the white-list in the firewall setting.
As for the output buffer handler, you may have something called Photocrati_Resource_Manager installed that may interfere with the scan process. My scan may still work fine but if it seems frozen or gets stuck while scanning see if you can deactivate Photocrati_Resource_Manager and try the scan again.
Please let me know if I can be of any further assistance.