1. Do you get the same behavior if you run the Geocode Addresses tool in the Geoprocessing pane with the same csv file?
2. Does the csv file contain any spaces or special characters in the name or field names?
3. Are you able to upgrade to the latest 2.9 patch?
4. What was the output field option you selected in Geocode Table? (All, Minimal, Location Only)
5. What is the output format of the geocode result? (shapefile, file gdb)