Occasional distorted display when scrolling text using JScrollPane

I have an application that displays text in a JEditorPane contained within a JScrollPane. 60 users have this application. Occasionally on one user's machine, when she scrolls the text the display suddenly becomes distorted. Part of the the text appears the way it did before the scroll and part of it appears the way it did after the scroll. The effect is like it would be if someone pulled 开发者_如何转开发some of the pixels down the screen and left others in tact. I don't believe this is a software problem because it only happens in one screen but I would like to help this poor user out. Any ideas?

Please check if you JDK version matched with this bug description http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5087395