We have 2 iPhones an iPad and an Apple TV and all of those devices are no longer able to load any videos on YouTube either via the YouTube app or Safari. The all toss an unknown error and will not play anything. I also have 4 windows based PC's on the same network and they all work fine. Searching the Internet suggested a router reboot which I did and I also rebooted our cable modem but no change. All Apple products are running the most current iOS. They are 2-4s iPhones, an iPad 3 and a ATV3, again all totally current. Any ideas.....?