when you try to send an Alarm mail or Event and you choose the Option To: Cc: Bcc:
in the window that appears you can select the mail address but you cannot confirm because the OK button is missing.
Release : 10.4.1
Component : Spectrum Core / SpectroSERVER
Work-around: write directly the email address in the To or Cc or Bcc of Mail Selected Alarms panel.
The issue is planned to be fixed in Spectrum 10.5