The last two beta releases of macOS 12 Monterey changed the behavior of a low-level graphics function used by Gtk3 that resulted in application windows not being able to display their content. I've fixed the problem and made a new GnuCash bundle, GnuCash 4.8-2, SHA256 20af888f1d1293a036b595145ad9e5338b3a92f868b6e4fca021d4cc7d9df36b. You need to use it only if you're using or planning to upgrade to macOS 12 Monterey. Regards, John Ralls