The ICAO director general for South America has been reported as saying that flying in Argentina is safe despite the lack of radar and that increased separation requirements should not lead to delays given the low traffic density. He also denies reports from the Argentinian press that there was a near miss as a result of the radar problems.
More detail in attached article (in Spanish) posted on a local forum:
http://www.salvemosaerolineas.com.ar...-adecuada.html