Old/Read mail changes to new mail?

When I opened up my mail folder (i.e., a folder I created within Mail for mail I have read) -- everything was "new" again and had the "new" blue dot by it. Didn't loose anything. Any ideas what would have caused that? We had two kernal panic messages recently (both occured when we had Mail open), and I'm wondering if this is a System related issue or possibly bad RAM? Running on Mail 1.3.11
Any insights appreciated. Thank you!
Lisa & John
Wisconsin

Regarding the kernel panics, check Resolving Kernel Panics for information on the causes and troubleshooting steps to take in order to resolve.
Regarding the messages re-appearing as unread, how many messages are contained in the problem mailboxes and what is their size?
How often do use the Rebuild Mailbox function on all mailboxes and especially the most active mailboxes?

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