Norton Facebook Auto-Scan issue

I seem unable to get the slide stay "Auto-Scan on" so that Norton can perform Facebook scans automatically.  This is what happens:

The slide is turned to "Off"; I slide it to "On" and the app blanks for a couple seconds; when it comes back, the slide is located to the "On" position; then it immediately blanks again for two seconds and when it comes back, it's "Off" again. (Please see attached figure).

What am I missing?