Do you mean that you get a blank screen? How quickly does the text disappear? Is it on any particular page of LW? Is it while you're downloading, or just random?

Try updating your Java. Use the JRE offline installer below. Remove your current Java version before you install the new one
http://java.sun.com/javase/downloads/index_jdk5.jsp

If that's no good, see if there's anything within the threads below that helps

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