When you do the IDR restores - how are they being done, in a test environment or a spare server on the production network? I know this may seem a pointless question but I have known customers try to do IDR test restores of production servers in their production environment.
I also want you to try a manual restore that is, don't use IDR - this should ascertain that your backups are OK.
Follow these technotes, depending if it is local or remote:-
http://support.veritas.com/docs/236240
http://support.veritas.com/docs/236286