[the girlie matters] tips, tricks, and things to do to my site: remember me misbehavior
I found this information while I was looking for something else: I was so excited to see a solution to this problem, I forgot what I was looking for.
If your MovableType instance forgets that you or your readers have already established a relationship with it, try this fix in your individual entry template.
Change
setCookie('mtcmtauth', f.author.value, now, '', HOST, ''); setCookie('mtcmtmail', f.email.value, now, '', HOST, ''); setCookie('mtcmthome', f.url.value, now, '', HOST, '');to
setCookie('mtcmtauth', f.author.value, now, '/', HOST, ''); setCookie('mtcmtmail', f.email.value, now, '/', HOST, ''); setCookie('mtcmthome', f.url.value, now, '/', HOST, '');