https://bugs.kde.org/show_bug.cgi?id=425062
--- Comment #2 from anim...@gmail.com --- This is weird, here the application launches properly, using macOS 10.13.6 too, and I had report from other users that it works fine for them too. It could be an issue with the OpenGL support on your computer... Please try this: -open the configuration file gcompris-qt.conf with TextEdit (or another simple text editor of your choice), which is in /Users/username/Library/Preferences/gcompris/ -replace the line renderer=auto with renderer=software -save the file, and restart gcompris This will activate the software-rendering mode, which is not using OpenGL at all. I hope this will fix this issue on your computer. Side note: while checking again, I noticed that actually I didn't sign properly the latest application (the .dmg was signed but not the .app inside). I just fixed it and updated a new .dmg . It was probably not the cause of your issue, but it's still better to have it properly signed... -- You are receiving this mail because: You are watching all bug changes.