I've only seen one report on a bulletin board of someone being able to get more pesos from an ATM machine - a Brit with an UK HSBC card at a local HSBC bank. He wrote that he could get multiples of 700 pesos a couple of weeks ago, but only multiples of 600 today. Other posters are reporting the continuing restriction at ~320 pesos.

Hopefully the US Embassy will get an earful, and the consular officer responsible for the newsletter will be making some more enquiries (and most likely more bucking passing).

I'm here in BsAs, but since I get all my ATM fees refunded, I've not tried to see how much I can get. I usually request multiple amounts smaller than 100 pesos so that I can get small bills.

John