>It seems that if there have been new messages since I last got the messages, then when I hit the reset icon *all* messages are reset, even the ones that haven't been brought down yet. IOW, I've missed reading some of the new messages since they've already been marked as having been read when I hit the reset icon.

You are correct. I need to find a way to have the reset applied to something more ok. But, I don't know how to achieve that presently. The problem is that you may refresh several times, might have read them all or not, and want to reset. There is no logical way of determining up until when the member wishes to reset.