Similar situation here.
EB2 (VSC-TSC xfer Mar 15, 2007) - PRIMARY applicant
I-140: PD - Aug 25, 2005; AD - May 15, 2006
I-485: Rct Notice - May 15, 2006
FP: Jul 2006 (nothing since then)
NC Cleared(?): July 2008 (per INFOPASS officer)
I-485 LUD: Feb 3, 2008 (no change in message - just the transfer notice from VSC to TSC)
Spouse (derivative)
NC Cleared: Oct 2007
FP1: July 2006
FP2: Aug 23, 2008
LUD1: Feb 3, 2008
LUD2: Aug 25, 2008
LUD3: Aug 26, 2008
Not sure if we should interpret the LUDs on derivative's EAC# as a good sign, or the lack of LUDs on primary applicant's EAC# as a bad sign???