MultisessionDVD is not working

When i burn a DVD-r without finalizing and later import it, everything looks just fine.
When i add the new files into the new session the DVD-gets unreadable. In windows it is readable and then all the files from the first session is listed but none working. The files from the second session is readable.

Any clue why this is happening?

I REALLY would like to burn multisessionDVDS that was the reason with using nerolinux in the first place.