Iran and Latin America

Iranian President Ahmadinejad is postponing his trip to Latin America with no explanation. I've seen "indefinitely" but I don't know if that is verified.

So what's going on?

I've argued before that his trips to Latin America (not to mention his promises of aid) are not terribly popular in Iran. Especially in terms of security, Latin America doesn't have much to offer Iran, so it would be logical for Iranians to ask why he is spending time there. For all his talk (and for all the media hype in the United States), Hugo Chávez can't help Iran much. Right now, Supreme Leader Ayatollah Ali Khamanei is slapping Ahmadinejad down in other policy areas. I can't help but think this is all connected and therefore part of the answer.