This is not really a problem to me, but may be a bug.
On odd occasions the icons net to the forum posts change at will!
This may be my connection, or something else. An example:
This morning I scanned through the PHP forum, and there were about ten posts
where the icon said 'NEW', so I read one, and when I went back to the index page, all the icons had
the 'read' symbol, although I'd only read one..... Strange....