Thank goodness for the forum search function, which precluded my opening a new thread on this. I first noticed the "red" problem on Youtube last night. Oddly, it wasn't 100% consistent; links to Youtube videos from other sites seemed to play with full color, while videos opened in Youtube usually (but not always) were monochrome red.
My first hypothesis was that since I have extensions synced for Chrome browser, the recent Cr-48 Chrome OS update changed Flash when I ran Chrome browser on my Ubuntu netbook, so I disabled syncing of extensions in Chrome, and restored from backup. Video is now playing in technicolor, and I am applying all Ubuntu updates since my last backup to see if the problem returns.
Now I have to go back and read through this thread from the beginning. There is nothing like an active and knowledgeable community of users.
Update: I started reading this thread from the first post, then realized it might be more productive to start from the last.
I just disabled hardware acceleration pref for Flash, which has restored full color Youtube videos. I'm surprised that this problem has been around for at least a week, without being resolved by the Adobe/Google/Linux community (disabling hardware acceleration just being a work-around).
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