We ended up solving the problem on our site by reducing the number of cookies we're using. Between vBulletin, VBSEO, Google Analytics, advertisers, etc we were generating more cookies for our domain than most browsers would allow, thus causing random cookie drops. The only continuing problem is that the vbulletin_inlinepm cookie (which doesn't follow the cookie prefix?) can easily get too big that IE8 won't accept it, thus dropping cookies. For now, we're simply nulling that cookie.
It'd also be nice if some of the vBulletin cookies could be combined into one (using subcookies)... I'm not sure why we need a separate cookie for userid, userpassword, styleid, sessionhash, lastvisit, lastactivity, etc. (I suspect some cookie separation may be required to prevent cross site issues.)
Hopefully vBulletin and others find this helpful.
It'd also be nice if some of the vBulletin cookies could be combined into one (using subcookies)... I'm not sure why we need a separate cookie for userid, userpassword, styleid, sessionhash, lastvisit, lastactivity, etc. (I suspect some cookie separation may be required to prevent cross site issues.)
Hopefully vBulletin and others find this helpful.
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