Same here. That would be bad, and if they followed the same pattern then the processing dates would advance only by a day or two per week, as I recall happened at some of the Service Centers (especailly TSC, if memory serves). Hopefully, much of that was due to resources being pulled and placed on other visa types.If I recall correctly, when the USCIS began posting receipting updates, they began with July 19-July 23. I remember service centers being stuck on the same date for several weeks (TSC), others moving by a day (VSC). While I-485 and visa processing took away a lot of resources from N-400 processing, I really hope that the monthly processing times won't follow the same trend.
Well, on the bright side of things, even if they only advance by 5 - 6 days this month then at that rate they will have finished the July 2007 PDs by mid - April or so. That would mean that most who filed in the weeks following the July rush would get an IL towards the end of April, with a June ID. That might still allow you to meet your target of getting completed by the September timeframe. Don't give up hope just yet - I am reasonably certain that the 16 - 18 month timeframe is just BS to help (a) manage expectations of applicants and politicians and, (b) prevent a deluge of lawsuits against the USCIS since they can argue that anybody whose application takes less than 18 months is still within the "currently stated" processing timeframe, despite the fact that that Congress mandated a 6 month time frame for immigration benefits.