My external drives no longer appear in Finder, BUT they do appear in Disk Utility (and network drives appear also)

Hi folks, I hope someone can assist.  I have a Mac Mini 2011 running 10.8.5.  All has been well. Suddenly, when I plugged in an external flash drive (USB), nothing showed up in Finder.  Things I have done:
Confirmed SideBar and other Finder preferences are set to show/reveal external, network, and internal HDs
Tried multiple flash drives and hard drives, using drives formated in GUID/OSXExtended as well as FAT and NTSF. None show up.
Confirmed that the Hidden flag in terminal is not set.
Note:  I can see the drives in Disk Utility, but the partitions/volumes are gray and will not be mounted.
Note: Network drives and internal drives appear and work as expected
Note: My network Time Machine also appears and performs as expected.
The only suspect I can think of is a small, free app I installed this morning called Caffein (which manages the sleep mode).
Also, I loged out and switched to another user account on the same machine (that I use solely for the purpose of troubleshooting), and it was similarly affected.
Thanks in advance!
Dave

This procedure is a diagnostic test. It makes no changes to your data.
Please triple-click anywhere in the line below on this page to select it:
diskutil list | pbcopy
Copy the selected text to the Clipboard by pressing the key combination command-C.
Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window by pressing the key combination command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.
Wait for a new line ending in a dollar sign ($) to appear below what you entered.
The output of the command will be automatically copied to the Clipboard. If the command produced no output, the Clipboard will be empty. Paste into a reply to this message.
The Terminal window doesn't show the output. Please don't copy anything from there.
If any personal information appears in the output, anonymize before posting, but don’t remove the context.

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