ISO that worked in the past, stopped working.

[subbase]

Strange thing.

On my A110 I have two iso files which played fine in the past but not anymore. The NMT stops at the "alway's backup your...." screen.
When I push "stop" it just returns to the file list.

The difference between these ISO files with others that still work fine is that these are from home made movies.
I have a DVD recorder and recorded a DVD from my camera playback which works fine. Then I used DVDdecrypter to create ISO and that worked well in the past.

When I redo this, it does indeed not play anymore so no corrupt data , so what has happened and how can I solve this?

[subbase]

I now made a rip with decrypter giving Video_TS map and that works. Don't know why the iso does not.