There is a minor error in Aion 1.4. It affects the time zone calculator. If you have a duplicated time zone installed (this includes the time zone itself and the same [or none set] custom name like: US/Pacific and US/Pacific) the time zone function will not work correctly. It just shifts time zones because of the combo box messing up with items (duplicated entries are being removed). So right now the only option is just to not have duplicated time zones (you can have duplicated time zones as long as they have different custom names). The bug will be fixed in the upcoming revision.