I just got off with support.  Intuit did it on purpose - with the latest update, you will no longer be permitted to have 2 versions open at once.  The only way to roll back it to uninstall & reinstall the software that you updated.  However, if you don't update, you can no longer use merchant services (which QB just lost a LOT of money from us as we use it for all payment processing - I am not looking for another payment provider)