New laptop = you have to set almost all permissions manually now.
Windows?
If so, you need to right-click on the installation directory (usually Program Files(x86)\AssaultCubev1.1.0.4), click "Properties", and go to the "Security" tab. Make sure your username appears and has all the checkboxes marked. THEN see if AC can make your saved.cfg.
Windows?
If so, you need to right-click on the installation directory (usually Program Files(x86)\AssaultCubev1.1.0.4), click "Properties", and go to the "Security" tab. Make sure your username appears and has all the checkboxes marked. THEN see if AC can make your saved.cfg.