Problems with DVD-R backups

[Mr Slippy]

I have a problem playing DVD-R movie backups in my PS2. They play OK on my player and my PC.

It seems the problem is when I create a new DVD (ISO) and burn the files to a disk it will not play on the PS2. Yet if I create a nero image (from the previously created DVD (ISO)) and burn that, that plays OK.

I have tried various media (Traxdata, Databsafe Classic, Verbatim) and have now also upgraded the firmware to 1.40 on my Pioneer A04 DVD drive. All to no avail my PS2 will not play DVD-R's that were created from scratch.

Has anyone come across this mystifying problem before???

Thanks