LR CC Classic Version 8: When you use menu "Picture" - "Develop settings" - "Update to current process version" in library view on a photo, which has already the current process 5, it gives an unexpected error (maybee the menu's are labeled a bit different - i have the german verison installed), see picture below:
RackMultipart20181016127064t39-500b2955-ed0b-4bc6-9662-7063812a4cfc-844594221.jpg
The error does not occur, if the process is older.