I sent mine in August via certified letter, too, with no activity in system yet. I do remember reading someone's posts, not sure if it was this forum or another, where they sent in their amended return in a april/may time frame with no sign of it in the system and then receiving their refund sometime in Oct/Nov. Maybe they are still processing the backlog of returns but once they get to it, it will go a little more quickly or they just not keeping up with the system as well as they should be.
Hopefully people will keep posting on when they get their refunds to give us an idea of what time frames we are looking at.
