Hey....pc et al.....
found an easy way to get rid of every message cummin' up da dreaded red.
Like you, when I log on to the Forum every post is bright red...ugh...what to do is:
open up a message you KNOW you've read
then
Click on "show All Messages" on the top right
and
voila
everything should be as you want it when the list re-appears.
sounds over-simple but it works for an eejit like me