I just checked mine and the Master Pedestal was set at +/- 0, and Black Gamma settings were all set at +/-0. I'm pretty sure that's factory default but I may have tweaked it.
You could always just reset the custom picture profiles to the factory defaults in the menu to get back the standard WDR. Just copy/back up any profiles you want to save to your SD card first. I copied the factory defaults to an SD card and then to my computer so I can restore them anytime.