Which version of LR on which OS?
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Try to disable the GPU.
Go to Edit (Lightroom on a Mac) > Preferences > Performance, and uncheck Use graphics processor.
Thanks guys, I am running lightroom 6 not the subscription on a Mac with El Capitan. The problem seems to be fixed. I downloaded the last version again of the adobe website and it seemed to fix the problem. Its nice to know people will respond and try to help. Again much thanks.