I'm in the same boat!
We signed an offer (Bank's asking price) the 2nd week of November, that was accepted by seller within 24 hours. We heard absolutely nothing until March 22nd-a counter offer for $10,000 more, which we immediately accepted. All required docs were uploaded to Equator by the 26th of March. To this date we've heard nothing from BofA and/or Fannie Mae. My agent does forward all info that the list agent gives him, but at this point the last correspondence I received (over a month ago) stated that LA had "escalated" the issue and has gotten no response -AND that we were pretty much at the "bank's mercy"...I know alot of agents say, "Not all short sales are the same, get back on the horse, and try again"...but at the end of it all you end up with NO HOUSE, AN ULCER, and 6 MONTHS WASTED TIME!!!
But cheer up, you may be in that LUCKY 15%, whose short sale offer actually gets a final written approval, and you actually close escrow before they tell you that the loan was sold off to Greentree, or worse-Nationstar!!!