Why did system suddenly "lock" most of my files?

HELP, PLEASE!
Two days ago a program suddenly ran and "locked" most - 36,000 - of my user-name files.  What caused that?
Now when I try to open a file I get message that (I) don't have permission to view it. 
Get Info for the file shows:
that the file is unlocked,
"You can read and write."
(Me)  Priveledge is read and write.
I've tried:
Get Info: Clicked box for lock and then unlock - still get permission message.
Doing this:
Launch /Applications/Utilities/Terminal and copy & paste this command at the prompt
chflags -R nouchg ~/Documents
Press return.
Result: Selecting all files in Documents and then get info: mixed permissions.  Most files in Documents have the permission problem.
Note: many of my files under my user name are not in Documents.  Most of these files have the same permission problem.
HOW DO I UNDO THIS PROBLEM?
WHAT MIGHT HAVE CAUSED IT
MacBook ProCore i7
OS X 10.75
Not using Time Machine
System Preferences - Users & Groups shows me as Admin and current user

After iTunes Match completes, here's how to resolve the missing or incorrect cover art issue:
https://discussions.apple.com/message/16737862#16737862
At least it worked for me and others...all cover art has been restored.

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