Yeah, I'm not sure I follow either. Let's see if we have this right...
On full disc, you get the error:
No media inserted.
Please insert a compatible media to start the write process.
On main movie, the process seems to complete successfully, but the disc is blank?. Is this right?
Are you still able to use the blank disc? is it really completely blank or just appear that way?
Try main movie again, but do this first.
"Common settings" > "General" >
Unclick "Delete temporary files when finished"
Remember the location of your temporary directory so you can find the files later on (just follow the file path).
(You can actually place this directory anywhere you want on the hdd, just as you can choose any target location on the hdd instead of your burner, but do whatever is easy for you).
Now, before you try to do another bkup, make sure your temp directory is empty...just delete anything in there.
How much free space do you have on your hdd?
Ok, try Main movie again. Let's assume your "bkup" is blank.
Go to the temp directory...the files should still be there, even though the process completed successfully and you clicked on "Finished".
You should be able to view the movie off your hdd.
Let us know what happens...