I'm not a PS3 owner but watch a lot of fansubs. It could be that the format of the episode is not correct for the PS3. Open the file up on your PC in either VLC or Media Player Classic and find the properties of the file. From there you will be able to find out if it is compatible with the PS3. The latest batch of fansubs use the x264 codec in an MP4 wrapper which i *think* the PS3 doesn't support.
HTH
