Stan,
It appeared to me that hidding a draw result in the Winning Numbers Manager had no effect on the statistics in the Analyzers. The statistics appeared the same as before hidding the draw. In such situation, using the filters that are based on the WNH principle would bring about incorrect results.
I had a problem with data in the Winning Numbers Manager. The draw which should take place on 01/01/2011, was actually on 31/12/2010. I entered this draw with the date of 31/12/2010. In addition to that the Winning Numbers Manager entered a kind of empty draw with the date 01/01/2011 which probably caused the problem. I changed the date from 31/12 to 01/01 and removed the empty draw. Now the Analyzers respond correctly to hidding draws in the data base.