Some keybindings stopped working

Hi there,

since an update, some keybindings are not working anymore. The three I’m missing the most are CTRL+ALT+UP / CTRL+ALT+DOWN and SUPER+L. They are mapped in the keybindings options, but when I’m i.e. using Firefox and press CTRL+ALT+DOWN it uses the DOWN key in Firefox.

Other commands for swiching workspaces, i.e. CTRL+ALT+LEFT are working fine.

Does anyone know how to troubleshoot this? I’m running Gnome 43.3 on X11 (NVIDIA graphics)