A friend had this happen. Turns out they had updated their router and it was the firewall in the router. Good luck!
I am using Samsung TV Model LE32N73BDX and Iomega Home network Cloud Edition 2TB storage device
The system appeared to work ok. All the films played fine. Then suddenly all films stored on the HDD (all in avi) disappeared. I have checked the HDD and they are still there. they are not listed anywhere in the Media player.
Can anyone tell me how to recover them