I hadn't but just did. Given that I've had this problem for a while, I'm surprised that it has not been fixed, but maybe people don't care enough to report it (it's just a commercial we're missing, not impacting my viewing the actual programming, so no big deal).
I took a picture of my TV while this was happening and have uploaded it here, so others can see what I'm talking about. It's on an SD set, but I don't think that has anything to do with the problem.