Hi Xandoff, my understanding is that Vioxx was created specifically to avoid causing ulcers. It is a COX-2 inhibitor, which means it should not target much in the gastrointestinal tract. This implies, if I am correct about this, that something else caused the ulcers. Other NSAIDs perhaps, especially aspirin, are the leading candidates. If you can eliminate those you are back to H. pylori as the next leading candidate.
Vioxx on the other hand will severely disturb your hormonal balance via blocking most series 2 eicosanoids. Nobody really understands what the long term consequences of that are, even though we known many may have died from it. Vioxx was a great drug for very short term use - but a nightmare for long term use.
Bye, Alex