Scan on boot up if computer...has mind of its own

Anybody experiencing this 'featurette'.
 
Uncheck the 'Scan on boot up if computer....' option under the Scan Schedule tabs in Settings, and then check on it after a reboot or the following morning (when you would usually have rebooted if you switch your PC off overnight).
 
Does anybody find that the option has somehow gotten itself rechecked, ie, it is ON again?
 
Have just noticed this (but to be fair have had some issues with this option before & uninstalled completely and reinstalled to try to resolve it.)
 
Be interested to see if this is happening to anyone.  Am running latest build .193.
 
Regards
 
 
Balders