The youtube HTML5 trial thing did not work. I had been getting these errors for a few months now, but I just figured it was an issue with Youtube because it was the only time I could really say that I noticed it happen. However, yesterday I downloaded an iMac app called tutor iMovie. That opens and shuts down right away and gives me that very long error message again.
That's what spawned me ask here what to do. I have also emailed the creator of that app...but haven't received a response yet... R. Proffitt also suggested I try turning off hardware acceleration, but I have no idea how to do that.