The built-in Pie Chart gadget does not work with the new CSAT Score custom field. From CSAT 5.2.0, please use the new CSAT Pie Chart gadget as below

Tip: Create 2 separate JQL to keep track of the categories that make your customers happy and upset

e.g. 

Happy Categories JQL for project "test"

project = test AND "CSAT Token" is not EMPTY AND "CSAT Category" is not EMPTY AND "CSAT Rate" > 3

Upset Categories JQL for project "test"

project = test AND "CSAT Token" is not EMPTY AND "CSAT Category" is not EMPTY AND "CSAT Rate" <= 3

Note: To ensure that only rated tickets are included in our queries use:
"CSAT Token" is not EMPTY AND "CSAT Category" is not EMPTY