I recently performed a system update, and now when I press Alt-Tab twice (to bring up the task selector), I receive an error message in a kdialog notification. The error states: "The Window Switcher installation is broken, resources are missing. Contact your distribution about this." It's important to note that this is a standard Artix system that I hadn't updated for approximately a month until now.
Could you provide more system details? (kernel version, DE version...)