I am having the same issue with the GUI locking up. It does not appear to be a VNC problem as previously alluded to as I can reconnect and the connection is noted in the container log.
I recently installed the CloudBerry Docker container and setup went well. I scheduled regular incremental backups and a weekly full backup. I then initiated a manual backup.
When the manual backup completed, the GUI turned all elements grey aside from a red "Backup service not running" in the lower right hand corner. VNC did not crash as I was able to close the tab and reconnect to the same screen. The container shell also continued to function as expected. Rebooting the container resolves the issue... However the situation is replicated after every incremental backup as well. My screen looks the same as phonso when this occurs.
EDIT: I disabled the detailed email notifications "In All Cases" (since I wasn't receiving them anyway) and changed to detailed notifications "When plan fails" and there are no problems.
I wonder if there is something crashing when it attempts to generate the email.
