Hi All, Just to show progress on this: - With Apple's X11 compiling/linking (and using the Apple's X11 runtime): The app did not run, just lock and no reports at all. - With Apple's X11 compiling/linking (and using the XQuartz runtime): The apps run without problems, pretty fast and stable, but no OpenGL rendering at all (set off screen: invalid drawable). - With the XQuartz compiling/linking (and using the XQuartz runtime): The app did not run (see below) X Error of failed request: 0 Major opcode of failed request: 149 (GLX) Minor opcode of failed request: 26 (X_GLXMakeContextCurrent) Serial number of failed request: 3318 Current serial number in output stream: 3318 This is just a little tests I made before going deep into this issues. I want to le you note that the custom app I'm running (beside the qtgears sample) is an high-end big/complex app with so many dependencies (on the Windows front), and wine made it works pretty well (Using the mix X11/Quartz runtime). Best Regards