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Phil will tell you to call Paul...
Paul stopped making 48h hubs a while back, emailed them about it and the response from the man himself was that too much material was being removed. The holes don't look much further out than other comparable 36h hubs. Assuming the spoke tension wasn't regularly checked and a spokes tightened court-side when required... I'd put it down to bad luck and buy something cheap enough to replace in case it happens again...
was it 48h? losing one spoke won't matter!
are the holes drilled closer to the edge of the flange to accomodate the extras from a 36h hub?
I'd email Phil and see what he says.