Sony BDP S590: not playing from USB stick
I regularly transfer files from my Mac to a USB stick (formatted in FAT 32) and play them via the Sony BDP-590. Last night I discovered that the BDP tells me that there are no playable files on the same stick I used last week. I tried a few other sticks with the same result. I tried the stick on the Humax box and it played without any problems. I tested the same stick on the TV and the video simply plays.
Could there be a problem with the USB port on the BDP? Would a reset to factory settings possibly work?
It's not a big deal because we can play the sticks through the TV or the Humax box. But it is rather puzzling.