Well, it might help, but what has the color profile to do with it? It is not that the colors are incorrect, my images are just completely grey, see posted screenshot. They are not visible at all!.
Besides that, I already calibrated my screen and it is fine now, changing color profile will undo that. Also, I had not any problems with all previous versions of Lightroom!
Also, two other problems remain:
1. Closing the application is not possible anymore. LR freezes on closing down and even waiting for hours does not help. Forced to 'Force quit'. After restarting same problems.
2. LR keeps on using 95% of my computer resources. My MacbookPro is unusable slow while LR is running.
Before asking what it has to do with it ... did you try?
For your other issues:
You are on 6.2.x, then I strongly suggest to roll back to 6.1.1 until 6.3 is released: https://helpx.adobe.com/lightroom/kb/roll-back-to-prior-update.html
Yes I tried and it did help. The performance is still very, very slow though. I'll roll back to 6.1 now.