What browser are you on? Chrome/Firefox both block Flash by default. You probably had Flash explicitly allowed for Warlight earlier, but since the domain has changed to Warzone those settings don't work anymore.
If you're on Chrome, just click the little lock that says "Secure" next to the URL bar. You'll open up a little settings menu and you can just set Flash to "Allow" for this site.
For Firefox, https://support.mozilla.org/en-US/questions/968858