Is this on HD 16:9 video or just SD 4:3 letterboxed material?
There was a station here in Chicago that for the longest time had a yellow line down the left side of its 4:3 letterboxed programs, on the left edge of the picture but on the right side of the black pillar.. Eventually, they upgraded to some other equipment and the line went away.
So I'd say it's not you, it's them.
-dickm