I confirm with José wrote. In startup applications preference tool not have any checkable applications. I installed all updates my system.Testing purpose I removed my home directory the .config/autostart/libcanberra-login-sound.desktop file, after this I start startup applications preference tool and experienced José wrote result.
This file missing in /etc/xdg/autostart directory too. José, I sending you an attachment.Try you copying this desktop file with your ~/.config/autostart folder, and execute startup applications preference tool. If the ~/.config/autostart directory not existing your system, need creating. This test desktop file default not enabled the login sound, but easy possible checking this with startup applications preference tool if the desktop file is present.
Attila
libcanberra-login-sound.desktop
Description: application/desktop
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