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I had the same problem after switching to Mathematica 10. The issue here is the following:

Export uses Rasterize to create the png image. The StyleEnvironement, which is used in Rasterized, cannot be specified as an option but is given by the $FrontEnd object (not by the EvaluatingNotebook[]!). You can change the StyleEnvironement by

SetOptions[$FrontEnd, ScreenStyleEnvironment -> "Printout"]

When you use Export or Rasterize now, you will obtain the "Printout" style.

Related questions on Stackexchange:

How to Rasterize in "Printout" style

http://stackoverflow.com/questions/6093559/how-to-export-graphics-in-working-style-environment-rather-than-printout )