Video Stuttering on certain sites

I am using a 27" iMAC, late 2009, with 12 gig of ram. I am up to date on all of my software and all of my updates. I am using Safari, but the problem I am describing occurs in Firefox as well.
I have an acount on KelbyOne. I have had the account for two years now and the instructional videos have always played flawlessly. Recently, and I cannot pinpoint exactly when, the video began stuttering like a defective DVD would. The audio is fine, but on each video I try to play the video is jerky and stuttered. I tried a sample video on Lynda.com and the result was the same. I have no problem with YouTube videos, Netflix, Adorama videos or any other type.
I have checked my Flash and it is up to date with the latest release. I have deleted my cookies, and restarted, but to no avail. I contacted KelbyOne and they said they have not changed anything on their end. The videos play alright on my iPAD whch does not use Flash, but HTML5.
That being said, is there a way to have Safari use HTML5 instead of Flash. I am wondering if that wil help or if all will be resolved seamlessly in a future update.
Thanks for any suggestions you might have. I am particularly interested in hearing from anyone else who has a Kely or Lynda.com account to hear if they are experiencing he same problems.

From the Safari menu bar, select
          Safari ▹ Preferences... ▹ Privacy ▹ Remove All Website Data...
and confirm. Close the window. Then select
           ▹ System Preferences… ▹ Flash Player ▹ Advanced ▹ Delete All...
In the sheet that opens, check the box marked
          Delete All Site Data and Settings
then click Delete Data. Close the preference pane. Test.
If you use a FireWire audio interface, disconnect it and test again. If you don't know what a FireWire audio interface is, you don't have one.

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<blockquote>Locked by Moderator.
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==
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== Description
==
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==
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==
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