We ran into an issue with SEP 12.1.6 MP6 unmanaged clients that we upgraded with the installer we downloaded from fileconnect. (The clients are not connected to the SEPM).
We are unable to make a permanent change to Download Insight Actions through the client UI. The Download Insight Actions always revert back to the Symantec defaults (First action: "Quarantine risk" - If first action fails: "Leave alone (log only)" and for unproven files: "Prompt")
We reverted back to SEP 12.1.4 pending resolution from Symantec.