This symptom is usually the result of using the Derby internal database.
In order to keep your database settings when upgrading to a new build, you need to first save the /database/AdminDB file to somewhere outside the installation and then copy it back in post update, replacing the new one from the install. There may also be a RunTimeCacheDB file that does not need to be saved. This extra step to save your Web Viewer database settings is one of the reasons we recommend using an external database such as MSSQL, Oracle or DB2 instead of Derby. Details on the Derby database save are:
Copy <your Windows Tomcat path>/webapps/CAOMWebViewer12/database/AdminDB
To <your temp save directory path>database/AdminDB