Hi Macktek - thanks for the suggestions. We use the forum software
Discourse with some minor customizations.
Unread posts should be rendered slightly brighter than read posts, is that not the case for you? If not, it would be interesting to know what OS/browser you are using so we can reproduce it here. (Read posts have the CSS class
visited set on them which should make them appear less bright than unread posts.)
As far as resetting posts to unread is concerned, I am afraid we are not aware of any way of doing this. You might be able to find a solution by checking on the Discourse Meta forums.