"This Honorbuddy version only supports WoW Patch 19243 and you are on WoW Patch 19342. Please go to Releases to check for updates." My WoW client appears to have downgraded it self.
Download the latest version of honorbuddy. http://updates.buddyauth.com/GetNewest?filter=Honorbuddy Then do a clean install into a new folder. Do not reinstall over a previous installation or move items from the old installation into the new one. you may need to wait till there is a new version of honorbuddy for the new version of wow.