I deleted the aux files. I also extended the timeline and looked for breaks / gaps but I could not see any. I did delete a couple of very small frames and then tried the make movies - again making a dvd using the automatic quality option.
I kept an eye on proceedings and all was going well until about 21,000 frame sand 14 minutes in when my pc turned itself off completely.
This leave sme wondering what caused this? Is it something to do with my pc and/or XP? Given that the previous day I managed to succesfully make a dvd that was 47 minutes long I do not think it is a memory issue
Alternaitvely is there something in that clip [although I do not know exactly I think it failed at around about this point before]. I had a loook at the 'offending' clip and could not se eany obvious issues. I guess the netx steps are to try again and see if it stops at the same point and/or delete that clip and see if the process can complete.
I will persevere......