ORIGINAL: aerowoof
I wonder if there is a correlation between [CA hinges] and larger than recommended power plants contributing to the problem as it was not a common problem years ago.
CA hinges are not the problem. I think the biggest reason you see so many instances of flutter nowadays is 3-D flying.
Since the advent of 3-D, Control Surface size has gone through the roof. This gives the control surface a huge mecanical advantage over the linkage.
So in the past, when the linkage had the mechanical advantage, now the control surface does.