Just picked up my nice 4K Panny UB900 player and been having a bit of a play and I have found that for some reason it is not recognising any files that I put onto a USB. It is recognising the USB stick but saying that the folder is empty. I popped it into my Oppo and it was reading everything fine. Anyone else struck this or is there something with Panasonic that I am missing. Cheers.