That worked back in Season One as the rationale for why the Doctor, having returned Rose Tyler home a year late, couldn't just get back in the TARDIS with her and try again. His mistake had created a timeline in which Rose was a missing person for a year, and since the only reason for a second trip would be to erase the timeline that caused that trip, a paradox would result.

But this time, it didn't seem to be suggested that the Doctor had somehow dialled the right number but the wrong month. Rather, it somehow felt as if the Doctor's life was to at least some extent synched to the Brigadier's. Of course, the whole point of the River Song plot arc is that this doesn't happen (indeed, quite the opposite) so again, how is this explained?

'Wibbly-wobbly Timely-wimey' is meant to be a metaphor, not a get-out-clause!