"Ghost text" in terminal, Yosemite + TotalTerminal (formerly Visor)
This one helped me:


  Open your Terminal preferences, go to Profiles > Window > Background (Color &amp; Effects), and set a light blur.
  
  I use 30% to keep anything in the background from disturbing the readability of thin fonts on an already translucent window, so I never noticed the "burn-in" effect when moving to Yosemite.


Source: http://discuss.binaryage.com/t/text-burn-in-when-using-transparent-backgrounds-since-yosemite/2849

However I set blur to 1% and "ghost" text disappeared.