It depends. It may happen if, according to the calculations, the pocketed area is too small for an actual "pocketing" material removal operation - but large enough for the "Clean-Up" pass. I believe that this can be affected by the available tooling for pocketing operations, "Clean Up Amount" and possibly the "Step-Over Percentage".
Are you getting this message, yet having material remain in the middle of the pocketed area after the clean-up pass?
Brad thanks if I had your email address I would send you the dxf and settings file also
this is a large pocket area maybe 2 or 3 square feet with 47 arcs and lines I have made so many setting changes I am lost, Daniel and the guys in programming are reviewing the files and settings
I have looked at Wills files and found the issue. THere were some arcs that were not tangent causing calculation errors. I have corrected the files and sent them back to Will.