This article explains how to resolve the GUI becoming stuck/spin when running the Synchronise Standby Database option.
GUI become stuck /spinning during Synchronising Standby Database option, on
(7) Applying incremental backup to the standby database.
However SSD via the Command Line Interface works fine
Applicable Error Code
The GUI becomes stuck/spinning during the Synchronising Standby Database option,
(menu 7) Applying incremental backup to the standby database.
- Remove all files from these temp directories: /usr/dbvisit/dbvserver/tmp and /usr/dbvisit/standby/tmp
- Restart the SSD with the GUI.
It appears that when there was an interruption of the SYNCH STANDBY DB process,
some tmp files were created and the GUI picked it up.