I just bought a 50 inch Panasonic plasma (TC-P50U50).
It works great and all, but whenever I connect my PC to it via HDMI, whatever text is on the screen (usually on some web page) blurs slightly, then focuses back to normal every 60 seconds exactly.
I tried this on my parent's 50 inch Pioneer and the problem disappears,
I called Panasonic and they have no idea.
When my Xbox is connected to it via the same HDMI and port, there is none of this.