All my blu rays are ripped using makemkv and stored on the WD My Book Live.
Most of the them play just fine on my TV (Panasonic) but some will not and the picture goes kinda blocky and corrupted looking. Sound is ok. The ones that fail tend to be newer ones, but it's no hard and fast rule.
If I run the same files (i.e. directly off the network drive) through a different media server (ps3mediaserver) all is fine.
So the problem appears to be Twonky. The same issue appears if I run the WD Twonky 5 version or if I upgrade it to Twonky 8, as described elsewhere on this forum (sorry I'm not karmarish enough to add links, but it's the "complete-guide-to-upgrade-to-twonky-7-version-my-book-live-o")
Anyone got any idea how I can have a working media server on the My Book Live?