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artie, I guess terminal must have repaired permissions because the pixelations have gone.

This is what happened in terminal;.

Last login: Mon May 17 14:16:21 on console
abcs-MacBook-Pro:~ abc$ diskutil resetUserPermissions / ~id -u~
Incorrect number of parameters
Usage: diskutil resetUserPermissions MountPoint|DiskIdentifier|DeviceNode UID
Reset the permissions of a user home directory.
Ownership of the affected disk is required.
abcs-MacBook-Pro:~ abc$ john daniell
-bash: john: command not found
abcs-MacBook-Pro:~ abc$ raymond
-bash: raymond: command not found
abcs-MacBook-Pro:~ abc$ j.daniell@bell.net
-bash: j.daniell@bell.net: command not found
abcs-MacBook-Pro:~ abc$ abc
-bash: abc: command not found
abcs-MacBook-Pro:~ abc$
[Restored May 17, 2021 at 6:03:16 PM]
Last login: Mon May 17 18:03:13 on console
Restored session: Mon 17 May 2021 18:02:00 EDT
abcs-MacBook-Pro:~ abc$

Where it says Restored May 17, 2021 at 6.03: 16 PM...does that mean that "Ownership etc" is not required? Q: What could have caused the pixels in the first place?
All's well that ends well. Thanks artie,

jaybass