I have some videos I converted from DVD to MP4 using the PS3 setting in Handbrake. I store the video files on a QNAP TS-109 NAS. The NAS is hosting the files via TwonkyMedia DLNA/UPnP and I have used it extensively with my PS3 in the past. I have some files that I have successfully watched on my PS3 a few months ago. Now these files do not play since I have applied two PS3 software updates. Nothing else has changed. Is there any way to downgrade to an older firmware? Is anyone else experiencing this problem?