I received the permanent residency today, albeit with a bit of last minute drama, but nothing serious: my file was "lost" somewhere en route from "headquarters" back to the office of migraciones on Antardida yesterday.
After waiting several hours (this morning) for the file that could not be found, I had to go to another window and request a "replacement" certificate documenting the "cambio de categoria" from temp to permanent and pay $50 pesos as if I had lost the paper...but that was the only immediate solution! I was told it might take two more hours, or two more days or two more months to locate the file...(yikes!). Fortunately, my permanent status was already in the system and accessible via computer.
Now I have six months to go to the registro to have the change entered in my DNI or I will have to return to migraciones and again pay $50 pesos for another "certificate" that will also be valid for six months. I plan to wait for the new "system" to be implemented before I go to the registro. I asked of there would be any problem if I waited and was told that once granted, permanent residency is permanent.