A coworker of mine, Darris Friend, found the problem. We're using address points with the "General - Single Field" geocoder. At 10.1 and earlier, the syntax for the python script was: arcpy.GeocodeAddresses_geocoding({TableOfAddresses}, {GeocoderName}, "SingleKey {AddressFieldName} VISIBLE NONE", etc...) At 10.2 it's now: arcpy.GeocodeAddresses_geocoding({TableOfAddresses}, {GeocoderName}, "'Single Line Input' {AddressFieldName} VISIBLE NONE", etc...) So SingleKey changed to 'Single Line Input'. Make sure you include the single quotes.
... View more