I created the pattern of holes in 2d, in CAXA, as about 70% were regular, it was just that 30% that spoiled the party. So I imported the dxf back into a sketch, thats when my troubles began. Essentially their seemed to be multiple issues with the sketch. Deleting duplicates worked very well , I like that tool within the sketch toolbar but their still seemed to be erroneous issues with the sketch which should not have caused a problem.
So in trying to fix it resulted in multiple regens.
Cary - this was using the new pattern feature.
in fairness I have tried this number of holes in the past with ProE Wf4 , and it just fell in a heap...
thanks