Defense + always set to inactive

I just uninstalled CFP 2.4 and am starting the learning curve for CFP3. The first thing I find puzzling is that on the Summary page I see "The defense + security level is set to inactive. I then go to the defense + setting and move the slider to various positions and apply the change. Then the summary page still says defense + is set to inactive. What have I missed here?

Did you select ‘install Defense +’ when you installed Comodo?

After you switch Defense + on does it require a reboot??

Thanks for the reply JolietJake – yes I rebooted after installation — I don’t remember deselecting any options — When I click on the defense+ icon at the top of the Comodo window I see the “all systems are active and running” message at the bottom of the window.