I can not run any version of F-Secure Mobile Security or F-Secure Safe for Android. When I try to activate the application notice appears:
Previously, there was no such problems. ( Android 4.0.4 )
Could you try to look for any old F-Secure message and delete it as it could block the activation now.
If that doesn't help, please open a support ticket so that our support can look into it.
Did you find an remove old activation message that might have been present?
Did you already proceed to open a support ticket?