Airplay problem on 4.4.4


I jailbroke my apple tv a week ago on 4.4.4 and all was fine.  I have noticed tonight that all of a sudden Airplay is not working.  The option no longer shows on the iPhone4 or iPad2 and in the main menu on the apple tv 2 when I go to computers it shows the user name etc, but even with iTunes open there is nothing showing in the form of a library.  The obvious things such as WiFi and switching the services on and off have been done but nothing showing.  

Anyone got any advice? 

Many thanks! 

I had the same problem. In my case rebooting my router resolved the problem, airplay functionality returned.