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It looks like the latests Build/Update (22509) and Parallels 17.1.1 fixed the issue. Now i can set de-DE for User and System.
I almost suspect that this problem only occurs with users who do not use en-US automatically (through Parallels installer) or manually. This could...
Yes, also with Secure Boot Enabled.
Found my problem cause: I Installed the German language Pack and set Default to it. Then the Error occurs. Switched Back to en-US everything is...
That was the case with me, but the next day the problem was back. I also reinstalled today and the problem comes back after every complete shutdown.
I did your solution (disable secure boot) and completely reinstall manually. After this, everything continues to work all day. This morning then...
