You probably installed the 64 bit version of Ghostscript. If the platform of Ghostscript matches the platform of your application it will load the Ghoscript dll. And it will use the command line if they don't match. And when you execute Ghostscript in a multi-threaded environment only the first thread can use the library. The rest will execute the command line and that is broken in the current version of Magick.NET.
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