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MichaelM92, Thank you for your help.
Yes, I've reinstalled the Parallel Tools many times. I also unistalled them, restarted and installed them again. Then, reinstalled a few more...
I now have this problem with Parallels 16.1.0, High Sierra (10.13.6) as the host and Lion (10.7.5) as guest. I could scale before, but since one...