Rick - I "think" I may have a clue about this. Does the preview funtion have anything to do with Javascript? The reason I ask is, it just dawned on me that I have not had the isse since I went here:
http://java.com/en/download/index.jsp

And installed Java runtime environment Version 5. Since then I've not had the preview problem. Might I have accidentally stumbled onto something?

Basil