I wonder if it's got anything to do with both machines having the same internet side IP address

Probbly not -- I'm having the same problem, from both my work machine (on a cable modem) and my home machine (on a 56K modem) and every time I go to the bbs from either machine I always find anywhere from two to 10 posts marked as unread that I have already read. In one instance, the same post popped up twice (on different days) as unread when I had already read it.

Even if I read all the posts from one machine, I still run across this.

tanstaafl.

"There Ain't No Such Thing As A Free Lunch"