You got DD included with BD (already patched)? You could try installing the
patch anyway.
If that doesn't help, do you have any points in Magic Barrier? One person had a problem when the Magic Barrier skill he had learned and the equipment bonus added up to 6. When they removed a skill point from Magic Barrier so the bonus brought them to level 5, they stopped loosing resistance when un-equipping the item with the bonus.
You can use
iZakaroN's SaveEditor (or from
Kiya's site, with description) to remove skill points. If the patch does not help, you can repeatedly learn Magic Barrier to bring your resistances back up. Max Magic Barrier and save, use the save editor to remove the skill points, re-load the save, re-learn the skill and save, and repeat as necessary.