Automatic updating Multisession?

I used to be able to have Nero update a multisession disc by itself. It would look to where I had taken stuff already on the disc, say “uploads1” and then show anything new as highlighted without me doing a thing. Now I have to do it labouriously. Anyone have an idea how the ability to do this was lost without me doing anything (that I was aware of, of course !)
And how do I get it back ?