Hi,
I have the inverse of this problem, specifically with The Dark Night blu (ripped bdmv folder structure in all it's glory). Other blu's appear fine (by other I mean Source Code as that's the only other blu I've got ripped at the moment!).
Basically, you know the opening scene where it pans/closes in on the building where 2 of the bank robbers zip line over to the roof of the bank, the first 5 seconds is fine, then I get severe pixellation on the outer parts of the screen for about 3 seconds, then this clears and it subtly goes slow-mo until they shoot out the window, then it's fine.
This happens exactly the same all the time I start from the beginning. No A/V software installed on HTPC.
NAS -> Gb switch -> HTPC. MC 17.0.177, Windows 7 (x86) SP1, ATI 5450 card with latest drivers. Tried both ROSTD and ROHD, LPCM and bitsreaming, WASAPI audio.