Desktop folders shift off screen and are not visible

Question

Every so often, my dock and all desktop folders shift to the right.  Some of the folders are now off the screen.  How do I move them back to the visible portion of the screen?  Thanks.

Answer 1

Back up all data.
Triple-click the line below on this page to select it:
~/Library/Preferences/com.apple.finder.plist
Right-click or control-click the highlighted line and select 
Services ▹ Reveal
from the contextual menu.* A folder should open with an item selected. Move the selected item to the Desktop, leaving the window open. Relaunch the Finder and test. If there's no change, put the item you moved back where it was, overwriting the one that may have been created in its place. Otherwise, delete the item you moved.
*If you don't see the contextual menu item, copy the selected text to the Clipboard (command-C). In the Finder, select
Go ▹ Go to Folder...
from the menu bar, paste into the box that opens (command-V). You won't see what you pasted because a line break is included. Press return.