Read / Not Read Post indicator not working

I am new to this site so please excuse if I missed / messed up a required setting. When viewing a screen with numerious post, some I have read and many I have not read. But the view displayed is the same. Generally “Not Read” are dark shade and “Read” are light shade.
I am using / have following settings …

[li]XP Home/sp2/all updates[/li][/ul]

[li]Firefox 1.5[/li][/ul]

[li]Logged in member (screen acknowledges my status).[/li][/ul]

[li]Cookies set to - Allow site to set cookies / Originating site only / Keep cookies until they expire.[/li][/ul]

[li]Cookies file - their are currently 5 cookies in use for this site.[/li][/ul]

[li]Java and JavaScript are “Allowed for site” (via NoScript extension)[/li][/ul]

Same here using FF 1.5 Sometimes it changes to read and sometimes it doesn’t. If i’m reading post for long time it seems to change to read more. If i don’t stay long reading the post it usually doesn’t change to read.

Don’t know about IE i never use it much :Z

Thanks for the reply rolling56.
Not encouraging news … does make following read / updated / posts a challenge.
Could try IE6 for a few sessions :sad:… see if it is unique to Firefox.

I just got used to looking at my log in time and the posts time. Been happening to me for awhile now.