This happened today and has happened before:

The Temporary Internet Files folder becomes immutable. It accepts no new
files . If you delete whatever's in the folder, it remains empty as you
browse around. Also the "hidden" attribute check box in the Properties
window for this folder is enabled, where normally it is disabled. I haven't
been able to correct this when it happens, but fortunately, it soon fixes
itself.

Any ideas about what's going on?
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ray124c41