Without a full conversion/burn logs, we can't see what's going on.
As mentioned above, the burn engine barely changed since v2.00
The new version fixed some conversion issues, so I don't understand why the old version would work and not the latest one.
All I know is PS2 are real picky players.
People with success use 1st class media (Verbatim, Taiyo Yuden) and burn slow. 2x (2.4x) or 4x MAX.
My 2 cents...