Did read the earlier postings on this subject, but I'm starting a new thread as suggested - if this is still being worked on for a later update, then guess this post can be ignored. I have one particular part (open rectangular box, i.e. tank) generated in Alibre (not an imported file). Part does have a couple of "shell" transforms. No apparent issues with the part itself, and the the Precise Section listing appears correctly in the Design Explorer. However, the actual section is either not shown or is incorrectly cut. Strangely, editing an existing sketch will allow the sectioning to appear - deactivating sketch removes the sectioning.