[Lynne]

Sometimes it isn't a stylevar, sometimes you actually have to add your own css. Add in some color to this class:

.memberaction_body.popupbody li > a {
color:blue;


}

And this should work also for the text of the visitor messages (I didn't look up the date class):

.postbit-lite .posttext {
color:blue;
}

Where exactly are you adding it? I'm adding it to additional.css on my test site and it definitely works.