One of my mailings is showing a large black box on the right-hand side of the message in the Outlook 2003, Live Mail, Outlook Express, and Windows Mail. You can view the test results here:
The Code Analysis of the affected mailers doesn’t return any errors, but there is a “Minor” alert for having Helvetica as the default font. Based on the way the main content table gets mangled, I would guess that there’s an unbalanced table row or table data tag somewhere, but the W3C Validator doesn’t find any such problems. (It does, however, find a good deal of problems, a fair number of which are introduced by our ESP).
Is it possible this a problem with the screen capture?