Now I can´t play my ISO and IMG

My ATV has worked fine for a long time, but yesterday it can’t play ISO and IMG files from my NAS, no problem whit MKV-files.

What can be the problem ??

My ATV runs ATV Flash 1,3

 

/MKL

In noticed the same thing today. I upgraded to 1.3 2 days ago, and played my first .img file today. It kept loading (spinning circle) for a long time. Pressing the remote buttons did not change anything, it seemed to hang. After a while the state went to buffering. I stopped waiting and yanked the power cable.