If you are also using a Panasonic TV, then you've probably knocked the AV input over to SVHS. This is a TV setting.
On Panasonic usually need o press green fastext button to switch between AV2 and AV2(S). 
In SVHS you will get B/W, unless inputing an SVHS signal.
                
 Cobweb
                
 March 2007