Q: Can't see email message content

Hello,

this may help:

1. Stop your Mail application from the menu: "Mail > Quit Mail"
2. Open the Finder and click: "go > go to folder"
3. Enter the following into the box, including the ~ (I recommend you simply copy-paste) ~/library/mail/v2/maildata/
4. Click [go] and in the Finder-window that opens, delete all files starting with the word envelope
5. Once deleted, restart your OS X via " > Restart"

See this screenshot for visual aid:

When you open your mail next, it will prompt to import mails. Agree with this. Now your mails ought to have their content back.

Let me be a bit more clear. 

The body of the message is there - but it only appears if I open the email.  But when I hover over the email header, there is no right panel that displays the body of the message. 

I am not sure if I explained this properly.

Jg

This is probably what's going on. Please find the bar on the right and drag it back to the left with your mousecursor:

That did it - thank you.

I came here with the same problem. Solved now Cheers!

You sir (or madam?) are a genius. 

Gahh cant tell you how much this helped.

Cheers.