Thom27: I agree, and have spent an inordinate amount of time analyzing results here.  (I wish it were easier to do, or that the flaw was ALWAYS evident, or the underlying pattern easier to discern.)  I'll continue playing less and less here, until it's remedied.  (I want to spend more time playing and studying--not investigating an unusual system flaw.)  I'm generally an outspoken skeptic of various "dice cheating" claims, but what's happening here is too much of an outlier to be dismissed cavalierly.

I also tried (unsuccessfully) to identify WHEN this skewness began.  I hoped that by doing so, I might help the powers-that-be to identify some code or procedural change that might have triggered it.