I have quite a few parts created in previous releases of SW ( currently using 2006 sp1 ) that contain circular patterns. Specifically models of perforated tubing where 2 holes are cut-extruded, linear patterned, then circular patterned. It took a bit of extra rebuild time, but was well worth it for accuracy in production drawings.
After using 2006 for a couple weeks, I committed to changing and removed previous versions. When opening one of the perforated tubing parts to reprint a drawing, I thought SW was hung up ( 15 min+ rebuilding the circular pattern feature ), so I checked the other similar parts, same issue. Parts that SW had flagged as requiring a rebuild would not ever actually open. Parts not requiring the rebuild would open/print/ect and convert easily until I CTL-Qed them. On a hunch, I opened one of the offending parts before leaving for the evening, in the morning it had actually rebuilt.
Feature Statistics:
091-2020 9/26/2005 11:22:07 AM Features 15, Solids 1, Surfaces 0 Total rebuild time in seconds: 3242.36 Time % Time(s) Feature Order 99.96 3240.99 CirPattern1