There have been several updates to Nectar since the days of X1, make sure you're running the latest. I can't recall if I was using it back in X1 days, but it's been working fine for me as long as I can remember. I must admit, though, I haven't used it all that much since X3...the VX-64/Melodyne combo works really well.
I don't know if there are any special upgrade deals from X1 these days, but SONAR has come a long way since then.