Slogan tokens are sometimes blank
Make sure that :
•You have not set the option Skip Slogan to a Holidays List in the property Slogan Rules. To easily see if this is the case, check if your token is blank on January 1st (which will be a holiday for most Holidays Sets).
•The current Slogans Set type is not set to Run Once Only. If this is the case, you Slogan tokens should become blank at the end of the output file.
See also Disabled Tokens in a Script.