Which exact version NUMBER of Lightroom?
Mac or Windows? Which version?
JPG or raw files? Which camera?
Can you link us to an example image so that we can see what you are seeing?
It can be a problem with a corrupt monitor profile or with the graphic card/driver.
Take a look here:
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This sounds like you have the shadows clipping indicator turned on. Press J or click the triangle top left in the histogram in Develop to make it go away.
Lightroom uses red to indicate clipped highlights and blue to indicate clipped shadows.
Pressing J toggles the indicators on/off.
Thank you that worked.
Thank you for your tip but my shadows clipping indicator turned on.