All documents issued abroad must have the legalization of the Argentine Consulate, located in the country issuing the document Ministry of Foreign Affairs, International Trade and Worship, or Apostille, if the country has ratified the Hague Convention .
http://www.migraciones.gov.ar/accesibleingles/?nomercosur_permanente
So all the documents needed to apply for residency, such as criminal background report, need to go through the Argentine consulate or embassy in the country you are applying from? This seem strange to me because I can't find any information on this board or anywhere on the Internet about it. Is this some new rule?