SHORT CUT COMMAND

HI,

I USE AUTOCAD 2014 MECH:, I CAN'T USE THE SHORT CUT COMMAND , REC(RECTANGLE) AND  O(OFFSET). I'V BEEN ALWAYS USING THESE COMMAND. SUDDENLY I CAN'T USE THEM. WHEN I CHECKED IN COMMAND ALIAS EDITOR, REC IS FOR AMRECTANGLE AND O IS FOR AMOFFSET. HOW SHOULD I CORRECT IT?

THANKS