ssx3 and manhunt copies using prasi-primo will not work in chipped PS2

so, my brother in-law gets SSx3 and Manhunt and wants his backups, as normal, no problem,
did redfaction2, devil may cry 2 and many others for him already.
So pop in DVD and use Prasi to create Global Image (as usual) and then burn GI using RecordNowDX (again as usual).
But they don't work! any ideas???
I checked out one of the earlier ones and burnt a copy (one I hadn't a chance to do before, some fighting game), and this worked.

The media is good, the programs seem to work, the backups for the new games don't work, what can I do?

Does the PS2 need a new version chip?
I know he got one of the earlier PS2's when they first came out and it has a magic chip installed, not sure what version.....