Currently, changes to a webinar room are always shown as successfully saved. In fact, these changes are not adopted in all cases — for example when the webinar is currently running live (both regularly and in test mode). In such cases, a corresponding error message should be displayed instead, which notifies the user that the changes cannot currently be accepted. Ideally, the message should also state the reason, e.g. that it is not possible to change certain settings during an ongoing webinar.