Could be a corrupted preview cache.
Close Lightroom. Then, using Windows Explorer/Mac Finder, go to the folder containing your Lightroom catalog. (usually inside the Pictures or My Pictures folder)
Delete the folder that ends with Previews.lrdata. Do not delete anything else.
Now launch Lightroom, and the previews will be recreated.
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When Library and Develop display different colors, it's usually caused by a defective monitor profile.
As troubleshooting. and as a temporary fix, set the monitor profile to sRGB.
If this fixes the problem, you should ideally calibrate your monitor with a hardware calibrator.
Per - you're my hero! :-D
Finally I got the same view in both moduls! Thanks a lot for your support!!
I would never have imagined that my screen's profile would be the key to two different views within one program...