Panasonic was actually the market leader in Plasma displays until that market kind of died. It's a shame because Plasmas had some notable advantages over LCD, but LCD was cheaper and easier to manufacture. Oh well.
Anyway, I would look for any options in the display to increase the frame rate and *turn them off* (note this is not the same as the "refresh rate", but that should not be an issue on your display, I would think). A blu-ray will be 24fps in most cases, 30 at most, but there has been a terrible trend in displays for some time to smooth out the "jerky" low FPS of cinema to be like 60fps or even higher. The problem with this is that it makes things look *too* smooth, like home video or something, and it takes processing power to do it, which means that especially for fast-moving scenes, it sometimes doesn't work that well. It might be called something like "true motion" or "smooth video" or some other bullshit. Turn it off, in fact start by turning off any "enhancements" the TV has, then turn them on one by one and make sure you like the results of each before leaving them on.
Of course it could just be bad blu-ray encoding.
Have you tried multiple discs?
- Oshyan