With the car running and the display on. Remove the Navigation SD card. Use a pen and push in the reset button above the recessed SD card slot. Reinsert the SD card. Wait for the system to reboot (the screen will go blank for a minute or two). The clock display should come back on. Occasionally it will take 2 attempts. This worked for both my Kias a week ago. And two friends Kias this week.I had to do a system update under the setup tab....just use the existing one in the stereo....takes about 25 minutes to complete.