Following David Dahlem's suggestion
(http://f11.parsimony.net/forum16635/messages/71634.htm)
I have added a new style which supports a better color distinction between read and unread posts. At least I hope that it does.
To use it please click on "Profile" and select "subRebel" from the drop down list. You can change between the different styles as often as you like.
Regards
Volker