No! Some times it does not show that a RFE has been sent to you and no email notification. Don't trust that. Don't call the 800 number. They have no idea of anything other than general information.
I filled I-751 at VSC on Nov 15th 2006. Got NOA Dec 1st 2006 and fingerprinted Jan 2nd 2007. Waiting....waiting....waiting... Starting from June 2007 I repeatedly and until Nov 5th 2007 checked the website and called 800 number to find out that nothing new had come and the case was pending normally.
Guess what; on Nov 5th 2007 I got a DENIAL letter stating I didn't reply to RFE they had sent me in June 2007.
Guess what more; the receipt number on the denial did not match the receipt number on my first NOA, the number I checked online all the Time. And guess a little bit more. The state abbreviation for Delaware was printed NJ.
I went to INS office and a very nice lady told me that all those “small” mistakes happen. The letter is received by zip code. The receipt number doesn’t have to be same.
I should file a new I-751.
After filling a New I-751 on Nov 13th 2007 I got a new NOA Nov 20th 2007. As me and my wife have purchased tickets for the Christmas holidays to Europe our dreams for traveling were shattered. I went to INS office again with the new NOA and the same very nice lady stamped my passport, extending I-551 for additional 1 year and stated that I can work.
But she did point to me: NO TRAVELLING!!!
Now I am waiting for FP notice.
On Nov 29th 2007 I also filled I-290B...Motion to reopen. Because I never received any RFE. I'm now waiting.....waiting....

Regards,
KAKA