PaulRB:
I think Marco nailed it there.Look at the sequence the above page from the data sheet: left-to-right it's DP, A, B, C, D, E, F, G
Not: A, B, C, D, E, F, G, DP, as I think you numbered them.
No, I'm not sure - I just tried to use the LedControl library. Guess the mapping is done inside the library? So if the mapping is incorrect it must be in the library?
And I was following the pin connection table given in this thread some time ago. Is that table correct?