Just tried installing Quicktime 7.6.5 and the system no longer hangs up. Apparently, my problem was that quicktime updated and the newest version 7.7.4 wouldn't work with Encore. And the 7.5.5 was too old. So Quicktime 7.6.5 is in the Encore Goldilocks zone. (Just have to make sure I don't update quicktime.)
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