"For some reason this darkening has stopped happening"If you mean that posts that you previously read have all become "unread", that could be because your browser history has been cleared or because either you or BrentfordTW8.com are using a different access route for some reason, so your browser doesn't recognise an older post as one that it has seen before.But if you're saying that you read a post today and the colour didn't change in the listing, that's odd. Have you changed any browser settings concerning History?If you have another browser to try, see if the same thing happens when using it.
Richard Jennings ● 5874d