I am having the same problem as well, and I think the part you are missing in your replies is that it's on OLD mail, too. It's not just the preview pane that's blank, it's whether I forward it, reply to it, do anything to it, I still can't read it. It's blank.
I did delete some temp files last night but they were only temp files .... and I didn't notice the problem after I deleted them but when I rebooted this morning.
Any clues as to what could have started this and especially how to fix it?
Thanks
Lori
