Comment 12 for bug 1093935

hmm, could you try running the 'xmodmap' command in the terminal (similar to the above comment), and also check if the Num Lock setting is related to the issue?

I'm wondering if this bug got reintroduced in Pinta 2.0 from https://github.com/PintaProject/Pinta/commit/478813d38db349a43417b9a155a0eea3fb0c3419 which started including the mod2 mask for macOS