I have just tried - and everything seems to be OK.
1) In the IN LIST, click the [Add Member] button.
2) In the pop-up window, search for the member you want to add to your list.
3) When the name of the member appears in the pop-up window, you should click on it in order to add it to the list.
4) When finished, click 'Save'
I follow the same procedure, but my IN LIST remains empty for some reason