Hi Tom,
Interesting..
Did you check the variant? I assume you have chosen generate immediately / background and through an info provider you are getting the required characteristics. There is a date range specified under the version which is used to read the infocube and fetch only related data.
Check if you have added any dynamic date in the production variants and it's reading properly. If this date range doesn't exists in infocube also you will not get CVC generated.
Thanks,
Rajesh Manoharan