This image basically shows just a part of a white oval with 50% alpha, with a glow, on top of a blue-ish background, in win/linux. The results, as you can see, are quite different.
I initialize the window using only the width/height constructor, thus using default options. Is there any reason that's immediately obvious to any of you devs as to why the resultant color would be different? My code is identical on either platform.