View Scan Log does not work for custom scans

1. install Sophos Anti-Virus 7.2.1C

2. run AutoUpdate

3. add a custom scan

4. run the custom scan

5. Scan menu | View Scan Log

Expected

The log for that scan.

Actual

View Scan Log is greyed out.

Workaround

6. run the predefined Scan Local Drives

7. Scan menu | View Scan Log

8. in Console, Show Log List

9. in the list, navigate to the folder for the custom scan; select one of the logs