Scary -- yes. I thought I had ruined an $1800 TV. I've been scared straight. I have ceased using the discrete On code, and have not had any more severe discoloration for the past week. I won't be using the discrete On code anymore.

I've found that the very minor purity problem that remains can be corrected by placing a tiny magnet on the edge of my screen. I've read several newsgroup posts that say this is an acceptable solution to correct minor localized discoloration.

Thanks for everybody's responses.