Hi 485sep,
1) If you live in Boston, then you can get the EAD on the same day at Boston, INS.
2) Whether it would cause a problem, I really don't know. INS may think that you are going in for a EAD after a year, does it mean he's changing jobs, does it mean he's lost his job and we need to verify his employment? BUT MOST IMPORTANTLY ALL THESE ARE MY SURMISES AND INS MAY NOT THINK ON THOSE LINES.
Moroever I am not a lawyer..
Good Luck..