It's a PayPal immediate payment.
I just looked in the database and it's showing transactions but under complete it's showing '0'?
I've asked for support from them and exhausted it, they said it's plugins or the forum style - which it obviously isn't.
It isn't my PayPal as I tried it with my friends account who also has a Vbulletin forum - still didn't work.
Could it be the database?
Arghh!!