Factorio Forums

I have a strange bug on forum with read message marking from few days.
There is something with Ideas and Suggestions forum that makes it always marked as having unread messages.
I can't find the message in question and using mark forum and subforums as read doesn't help. Clearing forum cookies also didn't help.

Anyone has any ideas what might be wrong?

You wouldn't be the first one: viewtopic.php?f=55&t=34983

Exasperation wrote:As I said in my first post, it shows as unread even after clicking both "mark topics read" and "mark subforums read". I did manage to get it to go away by going to the forum's main index and clicking "mark forums read".

Solution above helped.

As for reproducing the issue - it might have something to do with spammers - when it appeared there was a small wave of spam and I think it was being deleted while I was reading forums one by one.