Having problems with Sophos Home playing nicely with Time Machine under OS X Sierra v10.12. I removed it and installed NSM by downloading from my account. Terrible experience. Suddenly everything was blocked. Messages on my Mac listed the individuals in the left pane but the right pane with the actual discussion threads was completely black. I added Messages to everything I could find and even turned off the NSM Firewall and other settings. Still Messages was solid black in the right pane. Also other apps such as CrashPlan were reporting issues. I tried turning off the Firewall in NSM planning on using the built-in Apple Firewall and all I get are RED alerts that my machine is not secure. I removed NSM. Trying to deal with the firewall and other settings on my Mac was too much hassle.