Problems with World of Warcraft

Ever since upgrading to CIS 3.13, when I hit purge in the firewall rules, it says the launcher for WoW is invalid and asks if I want to purge that rule. If I purge it, the very same rule is created every time I open the game and then it says it needs to be purged again. This never happened before v3.13 and the same thing happens for the background downloader. The locations of the files are C:\Program Files\World of Warcraft\Launcher.exe and C:\Program Files\World of Warcraft\BackgroundDownloader.exe