I forgot to post the changelog. Bewitched isn't mentioned here (yet):

5.5.1.1, 2005 10 27

- New: Added functionality to remove invalid VOBUs from a
title set to the option to remove "Protection based on
unreadable Sectors". This fixes the error message "Out
of memory" from DVDShrink with some DVDs, which suffer
from a certain mastering error.
- Fix: The option to remove "Protection based on unreadable
Sectors" could cause DVDShrink to abort with an "invalid
Navigation structure" error with some DVDs, which suffer
from a certain mastering error.
- Fix: Setup program did not delete obsolete RegCheck.exe
file from previous installations
- Fix: Undesired high CPU use for several minutes when
checking for program update via internet connection