I have a TC-P50GT25 as well as an older Samsung plasma. I have monoproce hdmi cables connected to a variety of sources (360/ps3, dish hopper, appletv). I followed the break in and calibration procedures here on AVS for the Panasonic. On both and from all sources, in high contrast situations, the a darker color area *'bleeds'* horizontally.
I've tried every image tuning trick I can think of with no luck. Is this just inherent to plasma technology?