My wife had been through the similar situation and her visa was held for 3 months. I did lot of research and called USCIS  officer. Once you get U-221g, your case will be forwarded to dept.of labor. Per new immigration law, your updated status & employment has to be forwarded to labor dept. by USCIS. It's not an automated process. Due to back log and process being manual, some are unfortunate to have their system not logged in Labor's system. Labor dept, in turn, ask USCIS for your  updated information. After your background check is completed by labor, they'll issue clearance to consulate and only consulate can issue your visa. It's just a coincidence that some of guys got clearance before they sent email to consulate regarding their visa status. Otherwise you'll get same common answer "your case is still in admin processing..."  whether you call or email. Keep patience. You can see more information from lawyers in Murthy or immigrationvoice . good luck