I filed N-400 on 07/28/2009 and finished FP on 08/25/2009. Then my I-485 LUD changed on 09/27/2009. Then NBC mailed Yellow check list on 09/28/09 and I received it on 10/02/09 but no IL until this minute. Don't know what's going on. Does anybody know if the delay in N-400 update for IL depends on the DO? I come under Chicago DO.
Did you change your employer since you got your I-485 approved ?, May be they are checking to see if employer reported on N-400 same as on I-485 approval