I think it's an affiliate thing. Several months ago, Buzzr started showing up on my screen too narrow -- like the affiliate had the properly proportioned feed centered in a 16:9 frame with black bars on the sides, but then squeezed that 16:9 image to fit in a 4:3 frame. That persisted for about a week, but no one else mentioned it, so I assume it was local to me.
Recently (in the past few months or so), I've noticed more artifacts when the video has a lot of elements changing at once, like the bandwidth has gotten lower. Supermarket Sweep has always had its rough patches on that front, but now it's sometimes happening even on relatively static shows like Classic Concentration. I compared my antenna feed to the feed directly on Buzzr's website -- the artifacting isn't happening on buzzrtv.com, so it must be my affiliate.