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I have a multisession data DVD disc which I've been trying to add to with
no luck. I'm using the latest version of Nero.
To add I've selected 'make data disc' and on the options have selected
'continue multisession'.

It all seems simple enough , but when I come to burn the disc Nero gives me
an error 'unable to burn, unable to create lead-in'.

This seems is strange as I assumed Lead-in was created on original session
when I created the multisession disc. I've look further in the options and
I've noticed that 'disc at once' is highlighted as on. But I'm unable to
change this option as its ghosted out.

Anyone have any ideas on how I can continue this multisession disc?