Mine did the same thing till I found out the phone was waiting for my response...
"USB charging only"
have to select "USB charging only"
My phone is a Samsung Galaxy Proclaim on Straight Talk
So far I only get to charge my phone with the usb port. I use a head phone jack to get my music to the radio. I thought using the USB would transfer the info to the radio screen. I just have the 3.0 radio. Never really put to much thought into it till now. LOL!
USB port in the armrest works fine for me. Plug my iPod in there with a standard cable and it plays my tunes in the media setting, and I can just leave it in there and it recognizes my iPod everytime I turn the truck on and plays where I left off....
USB Port in the dash is strictly to charge, USB port in the center console will charge and connect your devise to the radio.
I have this issue of not being able to play my music connected to the usb port, only through Bluetooth. I never had this issue till I updated the software in my phone.
Uconnect support says it's a comparability issue the player on the phone conflicts with the player on the radio not sure what your using for a devise, I have an Iphone 5 running IOS 8.1.3 Just waiting for them to catch up with the tech again.
Have had this issue on my 2014 sport since new... every few months the usb will not recognize the mp3's on stick.. take it out plug it into another source plug it back into truck and boom it works... my dealer now says its an issue they are seeing and its the head unit radio and they are gonna swap it out for me .. told me this is an issue starting to be seen on the late 2013 early 2014 with the top of line media Alpine package so I will see if issue goes away once my new radio comes in until then I have to plug my usb stick into my computer or another device for a min then put it back into my truck to get it to play.. pain in the ass!