I had some success with setting the environment variable
QT_GRAPHICSSYSTEM to some value (e.g. 1).

The problem seems to be triggered by the line
 
   QApplication::setGraphicsSystem("raster")

in unity2dapplication.cpp:144 (http://bazaar.launchpad.net/~unity-2d-
team/unity-2d/trunk/view/head:/libunity-2d-
private/src/unity2dapplication.cpp#L144).  There is a long comment above
this statement which explains why this method is used but maybe a unity-
developer with more insight could look into this.

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https://bugs.launchpad.net/bugs/979756

Title:
  Top bar w/ radiance theme shows ugly colored fringe (unity2D and, to a
  lesser extent, unity3D)

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