Hi,
Just to rule out your kodi configuration hasn’t become corrupted, can please run the following on the command-line:
sudo systemctl stop mediacenter
mv /home/osmc/.kodi /home/osmc/kodi.bak
sudo systemctl start mediacenter
This will make a backup of your settings, and create a fresh one; If the result is the same, you can revert by reversing the 2nd step.
Thanks Tom.