We received av RFE and it did not affect our AP or I-485 interview date. We sent our papers in Feb, ND if around the 19th, and got an RFE in mid-March for tax forms for the Affidavit of Support which is original evidence for the 485. We turned that in and they received it on March 31st. We got the AP approval on April 20th, and our 485 interview notice on May 8th.
We were worried too, but for no reason. So don't worry. We are out of the ATL office and they are moving pretty fast. We still haven't got the EAD, but I believe that's because the interview is coming up next week. We did the fingerprints though.