That wouldn't really be possible unless you did some custom work to support it in another app or the commerce app for example.
Not currently, I'm using the basic IPN from Paypal.
There's support for this via "private goals" which hide related donation amounts to that goal. Another alternative would be to disable "can view donations" in the group permissions for your member groups.
It really depends on where you want to hide the amounts only or the donations all together. But generally those 2 approaches above can achieve either.
As I've just wrapped up IPB 4.4.x updates, I'll be caught up with support issues soon. If you haven't already, would you mind including admin login details in your PM for your forums? That way I can check over the settings and see what's happening.
Yes GBP is correct. I'll check over the language again and try and make it a bit clearer. Especially if it's saying "number" for any reason.
If you click on the goals name, it should have a "goals" page with donations for that goal only. Let me know if that helps or it needs further changes to it.