Hi, I am trying to query a custom setting but I am getting a very weird behaviour in a MANAGE package. Let's explain the case:

- Hierarchical Custom setting with a boolean field.
- VF page with a embedded LC. We do have a method in the controller to send emails. Through the boolean field we decide which behaviour we do want to have when sending emails.

- When I call the method to send emails from the LC, within the logic I query the boolean field from the custom setting, and then I have an if-else statement to decide the logic.

(the way I query the custom setting is:)

private static Boolean isQuarantineModeEnabled() {

MyCustomSetting__c config = MyCustomSetting__c.getInstance();

return config.MyBooleanField__c;

}

The "funny" thing that I don't understand is the fact that, after installing the manage package in a subscriber org, setting the right value to the custom setting boolean field, once I call the method to send emails from the LC, it does not work well  , although in the database the field has the right value, but for some reason salesforce still keeps the old value cached, and the if-else statement is not executed well.

Moreover, if from the developer console I just execute the anonymous apex, to refresh it:

MyCustomSetting__c.getInstance();   // NO updates in the database

then when I try to send emails again, it works, and it has the expected behaviour (the if-else statement works well). But unfortunately, after a while, it is stops working again, and you have to "refresh" it again. 

I am getting lost because of this as I have no idea why I am getting this behaviour. Does anybody have an idea about this? would be very useful!