Thread:Project:Support desk/Internal server error using ImageMagick .SVG files/reply (4)

Since you're on Windows, what happens if you take $wgImageMagickTempDir out of your settings? If removing it doesn't work, then make sure the webserver has permission to write to the temp directory or point $wgImageMagickTempDir to something that the web server has write permissions on (C:\Windows\Temp).