Authentication window not populating when attempting to move a file

When attempting to move a file that will need administrator authentication, the authentication window to enter a password does not populate. Thus, I am unable to move the file.

Linc,
I didnt get back with you this week as we've discovered a number of other "interesting" issues with the iMac. They all seem to (possibly) be related to privilege issues: 1. Cannot move photos to ~Library/Desktop Pictures, 2. Cannot access System Preferences/Security&Privacy (click on the lock to make a change and the User Name and Password "Unlock" window will not appear.) 3. When attempting to install the MS Office For Mac update, the installer will not respond. 4. Cannot boot from an external drive. The computer wants to reinstall the OS X Yosemite when attempting to boot from an external drive.

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