V.I.P.E.R is now vaccine registry compatible. Plus, Ed added a REALLY COOL FEATURE.
There was an issue with reading vaccines in Viper, not entering. That is fixed. Remember, Viper has been rock solid for three years. MU's requirement of exporting vaccines caused us to make a few changes.
If you are not on v6.0.26 or .28, you shouldn't use it. You must run maintenance once and have each user download the .26 or .28 version (all should have the same). Ed can tell you if there are any differences.