On importing CR2 images, LR calculates the Histogram and the image goes black, and cannot be recovered.
I am at a loss as what to do
Sorry for the unexpected behavior of Lightroom.
If in case id does not help follow the instructions mentioned in this link to roll back LR - Roll back to a prior update version
That seems to have done the trick. I am new to LR, coming to it as a result of Apple ditching Aperture.
So, be warned there might be a few "silly" questions coming your way from me!