Ever since i updated my mac software a couple weeks ago my display in LR is off. The photos are not exporting this way. so it is just the display. I have looked everywhere and can not figure out how to fix it. It is hard to edit like this as I can not view my images properly. The darks have loss of information and are blotchy and
sometimes there is banding and vignetting on my images yet i export them and they are completely clear.
Lightroom 4 and 5 color management is broken under Sierra, it's been reported in several threads here recently.
Lightroom 6 and CC work fine.
Apparently it's a case of dropped Apple support for some API or framework used by these old versions. Your only option seems to be to upgrade Lightroom to a current version, or roll back the OS.