Thanks, Mike & Vincent.
I had tried reindexing the file with WM editor, but it didn’t fix the problem.
As to doing a screen capture — DOH! — as Homer would say. I didn’t even think about the most obvious and simple way to do it. Do you lose any quality doing it that way? I guess if you sample it at 100% original size, a pixel is a pixel is a pixel…
Good point about copyright. I was aware that CSPAN is copyrighted, but in this case I’m capturing streams originated by the committee itself, not CSPAN. Not sure if something originated by the taxpayers is protected by the Digital Millenium Act, but since my use is news and commentary, presumably — hopefully — it would be fair use.