dvipng not running or crashing when called by MediaWiki on Windows 8

Hi,

I am working on a pure TeX extension for MediaWiki, based on the
existing Math extension, and removing the ML code and calling latex
and dvipng directly.

The extension  works on Linux but on Windows its a different story.

dvipng is hanging when called. The same command line called from
Windows 8 works fine though.

Any help welcome,

Aaron

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