I realize that this is an old thread, but I just ran into this situation myself.
One question, though. You said that you had to "go into your pollers to tell them to use the new server".
Did you mean that you had to go to the "Engines" table in the database and change the Server Name in in order to restore the node tree to working order?
yes, see page 3 of this doc. for the steps.
www.solarwinds.com/.../OrionServerMigration.pdf