I'm kinda puzzled...when you say that you were not allowed to adjust status, does that mean INS notified you or denied your application or you just went ahead and filed for your own I-589? Because mine seem to be the only case I read in this forum (and believe me I've searched the forums) where INS granted them the Residency. Normally they got denied and were asked to doe the I-589 on their own.
They normally do not get denied. The INS sends the person a notice saying that their adjustment application is being put on hold and the person should file a new I-589. Once that is done they will resume processing the I-485.