Try setting the colour temperature of your monitors to 6500K (I think). Check the grey on WPF background for true grey also check whites and blacks for a true tone with no colour. It might be the two monitors you refer are set at different colour temperatures. I am away from my editing monitor at the mo but I am sure its set to 6500K. If the colour temperature is wrong then greys will be displayed with either a yellow, blue or pink/red tint. compare to a white paper besides the monitor.
Hope this helps for a quick reply to your quick one
