I have seen this problem for a while, but not consistently. Basically it always starts to happen when I'm viewing the last mail on the thread and a new mail comes in. When I select the new mail, the highlight still sticks to the last mail I viewed. And starting from this point, whenever I switch to another mail on the thread, the highlight sticks to the mails I previous selected. So the highlighted mails become more and more if I keep on selecting mails. But the mail body pane can load the contents of the mail I last selected. And this problem goes away after I restart mail.
*** This bug has been marked as a duplicate of 121336 ***
Status: NEW → RESOLVED
Last Resolved: 17 years ago
Resolution: --- → DUPLICATE
verified as a duplicate
Status: RESOLVED → VERIFIED
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