If you can successfully bypass them, then it should be safe to delete/remove your VOBIds, in question, in MenuExtras.

Just use ifoedit and the delete playback button.

thx for the info...looks like i got it.:-)) frank

most time i follow the safe way....i dont delete unwanted cells but blank them as suggested... thx for the info awe007

blanking is a good way of getting rid of intro warnings etc, and cuts the size of the dvd down, so that its closer to fitting on a DVDr.