We have seen the issue with the vaccines, and migrating them from version 4. We are working on a new release that should correct this issue. When you update to the new release, and run the tuner it should bring back the vaccines, and allow you to migrate them again, and you should not be missing any at all. All the dates should be displayed right as well. If you have some patients who have not had the vaccines migrated yet, I would hold off till you update to the next release.
-Eric
