Sqldeveloper 188.8.131.52: I've got the exact same behaviour as described in https://community.oracle.com/message/9856841 - unfortunately the problem has not been solved there. So I try myself.
I have a bunch of ldap-connections for which I cannot change the settings. Specifically I wanted to change the connection colour. As described in the mentioned thread I can change the settings in the settings window, but when I hit any of the buttons "Save", "Test", "Connect" etc. nothing happens. I cannot persist the changes. Any ideas?