I have had my VAR in and there was no solution currently for this.
When we had the revision in the rev table on the drawing being driven by Vault, the previous rev line would revert to the newly created revision. We would have to manually change it back and update the new line to the current rev. There is an obvious glitch in the software that is causing this.
What should happen is when the vault is driving the revision block the new revision row comes in and not only shows the newly created rev, but leaves previous revision lines as they were.
This condition also seems to exist for the description. In general it seems like there is a communication issue between this revision block and vault.