I've seen T8250: PNG replacement image for .SVG does not show transparency gradient correctly and T12469: SVG -PNG conversion error in Wikimedia? and don't _think_ this is a duplicate.
The SVG of the GlaxoSmithKline logo looks perfect: http://en.wikipedia.org/wiki/File:GlaxoSmithKline_logo.svg
The 200px and 500px rendered PNGs look great (using the links below the image). However, the 1000px and 2000px versions lose the orange gradient.
I don't think this is an issue with the SVG: I can download the file, open in Inkscape, export at whatever size and it looks fine. Is it a problem with the PNG renderer?
OS: Mac OS X 10.6
See Also: T29465: SVG thumbnail generation fails due to bad namespace handling in SVGMetadataExtractor