I don't have them with the old TsWriter.ax ...On some channels I have a strange line on the top of the screen...please see attached screenshots.
Those lines are definately send by the broadcaster. You can use the crop setting in MP to cut few pixel lines of the video frame to get rid off those.
I'm 101% sure that it's the broadcaster as it's nearly impossible that we could create something like that by accident when decoding the TS packets. I have seen the similar "corruption" in my broadcaster's stream. Broadcasters simply don't care to remove it (if it's moving it's most likely some timing code) as almost all tv's and settop boxes are cropping some video data from the edges.