Hi,
Have you made a tutorial on Shake Reduction? There are many options in the menu but I'm not sure best way to use them.
As an example, I have a walk through clip of a busy market. The result with basic settings is a small image in the centre of the screen with a note to say alter settings. I have other clips where it works fine. I'm guessing there were some large movements as I turned corners in the market that were outside the scope of the basic settings. Another setting had the borders fluctuation.
Regards
John