I have read several forums about dvd and multi session and am having similar problems I try the fixes but I still seem to have a problem. My issue is at the end of the day, we would like to create an image to burn or burn from a certain dir to a DVD either DVD+R then the next day take the next image and add it to the dvd until the media is full.
I am using Nerocmd 1.7.0.7 and Nero API 6.3.1.10.
I always get get the 1st image to burn fine on DVD+R, when it goes to burn the 2nd image I get Invalid field in command, then Invalid track info.
But I can use the same command line and burn to DVD+RW and it works fine no matter how many times I burn to it.
The current line I am using to burn the 1st image is

nerocmd
-- write
--real
--drivename e
--detect_non_empty_cdrw
--recursive
--dvd
--iso "TEST"
--c:\1

The 2nd line I use is
nerocmd
--write
--real
--drivename e
--detect_non_empty_cdrw
--import
--recursive
--dvd
--iso "TEST"
c:\2

I have tried other variations that are suggested in the forums like adding --close_session to the command, still doesnt make a difference. I can go into Nero Burning Rom and it does work on the DVD+R. Does anybody have any suggestions why it wont work on DVD+R but it will on DVD+RW?