Voted best answer
The Orange cross will come on Alarm Bands/alarm line/alarm list borders only when anyone of the configured redundant event collector service provider lost its connections from the service group.
Check that all your configured event collector service groups are up and running.
If you know ApplogViewer, use it to execute the CollectorStatus operation on the primary AlarmManager service provider. One or more Event Collector groups will likely show "Connected, but with subscription *Inactive*" - restart such Event Collectors.
Regional ABB Support shall be able to assist if you need more assistance.