[oXygen-user] WARNING "Couldn't flush user prefs"

Problem: "Couldn't flush user prefs" Background: <oXygen/> 7.1 on Fedora. New user. Before the company bought us commercial licenses (just this week), I had previously downloaded and tested a trial version of <oXygen/>. Behavior: After <oXygen/> is launched, this WARNING message gets printed to the terminal from which it was launched, every 30 seconds: Mar 9, 2006 5:39:20 PM java.util.prefs.FileSystemPreferences syncWorld WARNING: Couldn't flush user prefs: java.util.prefs.BackingStoreException: java.lang.ClassCastException: org.apache.xerces.jaxp.DocumentBuilderFactoryImpl What's going on here? Thanks, Ken