Thanks Willx, I've been meaning to download the update but just have not got round to doing so, guess i have good reason now, will give it a go tomorrow.
This happened to me today. I held down the "mute" and "tune" (or whatever the right side button is) for 10 seconds. That rebooted the system and I got the jeep logo and all was well. Did it at a stop light with the car running. I have a mid-September built '14 limited with the latest uconnect