Why does the 10.1 geocoder yield different results on the same dataset?
All of the geocoding parameters are the same, the only difference I see is that the Standardized Address checkbox is greyed out in the 10.1 Geocoder. I have created several geocoders including single address and general address all with the same results.
Here is a specific example:
These addresses were matched in 9.3 but were unmatched in 10.1
There is really no bug to fix, it is a default feature. By default, searching without zones is not turned on. If you open the locator properties dialog and go to the "Geocoding options" section, just change the "Match with no zones" property to "Yes". This should solve your problem.