There are 2 options in the Colorizer, One selects the color, and the second selects the intensity, You should make sure the one that controls the intensity is properly placed to where the color will show, otherwise any color you select from the other one will just look gray.
so choose the second scale, and drag it to the right.
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Ignorance is not necessarily Bliss, case in point:
Unknown has caused an Unknown Error on Unknown and must be shutdown to prevent damage to Unknown.