When shooting with some color preset, like monochrome, the camera saves the JPG preview using the same preset effect (the reason for this is that the JPG preview is used when reviewing images in camera.)
So, when you do this with a monochrome preset, there is no quick way to see the full-color RAW photos without actually re-rendering those RAW files. If you download and install Adobe's DNG Converter, you can tell Photo Mechanic to use that program to render your RAWs. Be aware, it won't be terribly fast. (This setting is under Preferences > Render Cache)
-Mick