Till now I've had the histogram set on my screen when filming and when I'd hit that little button with the plus/minus to apply exposure compensation the histogram would remain on the screen. This meant as I compensated exposure I'd be able to see it's impact on the histogram and sdjust accordingly. Now suddenly for some reason when I hit the exposure compensation button the histogram disappears from the screen. I can turn the wheel and compensate exposure but without the histogram I have no guide. What could have happened. All I've done recently to the camera has been assign a new function to one of the function buttons. I must somehow have make some inadvertant change in the process.

Can anyone tell me what I can do to bring back the settings to where they were - histogram remaining on the screen as I apply exposure compensation.