I seem to be experiencing a completely different issue now. The 2.8.1 upgrade fixed the crashes on dragging/dropping issue for me, and I was very excited. However, something worse seems to be happening now. Taking a new screenshot seems to overwrite the previously saved screenshot. To reproduce:
take a screenshot with skitch
set the filename at bottom left in skitch, i.e. "test1"
drag/drop it into a folder in finder
take a second screenshot in skitch
note that "test1.png" (the saved version of the original screenshot) vanishes as soon as you take the second sc