It is very likely that it is just coincidence. Many stations are reducing staff right now, and when they send an intern in to swap equipment and a mistake occurs it can go for a long time without being noticed.

I can't even begin to describe the issues the 'local' WB has around here. They have a ground loop at the studio that is passing the hum through to the cable feed. Only that channel has the hum. :rolleyes: Been going on for weeks now. They also have issues with whatever machine records the feeds for their syndicated shows. Every few seconds there is a glitch where the audio speeds up and down for a fraction of a second. Weird stuff. No other channels do this so I know it is the WB.

So it may have been something that was in both channels, just out of phase, therefore routed to the surrounds, and in this case then a problem with source material.

I would think so. That is the problem with "finding problems" when watching broadcast TV. There are so many things that go wrong at the individual stations that I hate to trouble shoot via braodcast TV. My ABC affiliate has the worst picture and sound in the world. All other stations can come across great but if you tried to adjust to that station it would drive you nuts.

By the very nature of M-S processing, the S (or side channel) has a lot of out of phase information in it. If the TV station is doing M-S processing, and someone plugged the M into the S feed it could very well send your center channel into the surrounds.