I just realized this issue when I was coding this plugin. http://xenforo.com/community/resour...s-contest-winner-page-of-day-week-month.2831/ So I was coding this and I encountered an issue while saving the options. I use a callback for providing the options. I use the xenforo class to get all the groups present. Then I render them in checkboxes using a prebuilt xenforo template. It works fine till here. I also use a custom validation of options. In that I call a function from the model which updates stuff. I am not using any data writer here, just for simplicity sale. Now whenever I change the select boxes input, I.e. I change the groups allowed within in admin area, and hit save. It saves but the function in model isn't called on validation. Now when I hit save again without changing the select options, the function in model get called.