Since the JB update, my message headers download but the message body won't display when I open a message. This issue is occurring on both gmail and corporate/Exchange accounts. Is there a fix for this - or am I going to need to find a 3rd party email app?
Is this still happening? Sometimes it just takes a little time for everything to settle down and work correctly. A lot of data needs to sync back and forth after a major update. Have you made a font change or applied any power savings settings that may have changed font and background color?
PS: If you are using the stock email app, then try the Gmail app or K9 Mail or something else.