Hey there,
Wow that was a thorough post! You were very specific about everything, and that helps.
It honestly sounds to me like you’ve tried most of everything that I would suggest you try to try to figure out the problem short of actually reinstalling the software. I don’t think the problem has anything to do with the specific license that you’re working with – that should effect performance one way or the other. You’ve trashed your prefs already, so no point in trying that again.
At this point I would probably suggest doing a complete reinstall of the software. If that doesn’t help you might need to think about doing a fresh install of the OS and then reinstall the software fresh. Those might seem like drastic measures, but it’s usually a last case scenario for diagnosing the problem. You’re computers should clearly be fast enough for DV.
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Paul Escandon
Producer | Director | Editor
Apple Certified Trainer – Final Cut Pro
Oremus Productions
http://www.oremusproductions.com
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Adjunct Professor of Media
John Paul the Great Catholic University