Have you tried to just do a "REFRESH" on the desk top? Also if you'll do a "RIGHT CLICK" on the "ICON" then scroll to the find target button and click, watch for the "APPLY button to light up (from gray word to black word) then click the apply, it should work then.

Also: Right click on the desk top, then properties, go to the Effects tab and click, Make sure that the ICON USE ALL COLORS box has a check mark in it, at the top click the DEFAULT ICON button,

By doing these three items should straighten out the problem! Have a good day!