I applied for an EAD in April 2004 along with an I-485 etc. The EAD was applied for through e-file.
I heard nothing for 90 days, then made an appointment with Tampa USCIS.
I arrived and was told that as I e-filed the EAD application before I received my I-485 notice of action (but after I sent the I-485 pack) that my EAD COULD be denied. I was told that they couldn't issue an interim EAD and that I'd need to apply again. She then laughed at me and I was asked to leave for no reason.