@ustk haha don't use that, I'm probably ditching it again soon.
Other than the glitches, it was doing its job really well. I hope there's a good one to replace it with after ditching this one. Or whatever the problem is with this one, I hope it gets fixed.
OpenGL is not color managed. As a consequence, it might require additional effort to devise solutions to specific color problems you may encounter when using it. The fundamental problem is OpenGL has one set of assumptions, and the display buffer has another.
JUCE has now apparently fixed it, here's the commit