I replaced the incandescent bulb in the fixture at the top of the stairs with a compact florescent spiral bulb and noticed that it dimly, steadily flickers when supposedly off.  The fixture is controlled by a switch at the bottom of the stairs and one at the top of the stairs.  The switches are illuminated style green.  I put my meter on the fixture and it read (give or take) 120 VAC when on and 60 VAC when off (which I know is wrong and part of the problem somehow).  Can anyone offer an opinion/solution to this situation?  Thank you.