Interesting, could this be why my footage is playing back very jittery and not scrubbing well at all? I use 3 Sony DLR's with what we do. All AVCHD 1080p at 24fps mainly. On FCPX it was very smooth. I thought it was becasue I was editing on transcoded ProRes in Final Cut and working on the native footage in Premiere CS6. Even at 1/4 resolution it seems jittery with a Mercury enabled card and plenty of RAM on Premiere.
Is this the bug everyone's talking about or is long format, spanned MTS clips something different?