[Gimp-user] No Histogram in Levels

[Rick Snedeker <rsned comcast net>]

I’m running Gimp 2.8.14 on Mac OS with plug-in for UFRaw.

In the Levels dialog no histogram displays in the Input Levels for the Value or Blue channel, unless a very 
very small flat line qualifies. Red and Green channels display histograms just fine.

The image consists of 1 background layer.

Even without the histogram I can still adjust the sliders.

Am I doing something wrong?

Thanks,
—Rick