Are you sure that you are still bulk-loading?
Try to compare the code (and LOG) between 3.4 and 4.2.
Has something else change in your environment apart from upgrading SAS?
Still no answer? Then this might not be a DI Studio problem rather than a ACCESS to Oracle problem, and you will probably find that the best way to resolve this is by opening a track to SAS support.
/Linus
Data never sleeps