Overview:
Why are annotation color preferences not retained in Vault?
Root Cause:
The Annotation Color selection is retained in the Browser and this browsing data is not saved on the User's machine. The browser is set to delete browsing data after shutting the application off.
Solution:
Disable deletion of browsing history, cookies, and data upon closing the application.
Related Documentation:
Vault Help Documentation: Annotating Documents - Annotation Color Selection