If you think nothing has been immunized, please make sure you have clicked on “Check system” which can be found on the navigation bar on the left. This will check for already applied immunization.

The system is still immunized when you close Spybot.
In order to see it you just need to manually "Check System". We will improve this feature, that it will automatically do this once you open the immunization. This should avoid misunderstandings.

Best regards
Team Spybot