I thought that Comcast’s decision to delay the start of a Cubs broadcast last week so it could show commercials and promote its mediocre late-night sports news program was pretty bad. But last night’s performance was even worse.

Bottom of the ninth inning, Cubs trail by two, and — pfft! — the screen goes … purple. The Cubs went on to lose uneventfully, and so far as I know the screen is still purple.

Comcast Sports Net has got to get its act together. The Cubs should insist on it.