I'm having the same problem for days. I'm running Chrome with default settings, never had problems regarding cookies being refused, in this site or elsewhere. Didn't use any other devices or browsers to visit the Nexus during this whole period. The list seems to work correctly once a day (in the morning, when I power up the computer) but refuses to refresh itself during the whole session. The read topics result unread when I reload the page unless I mark everything as read myself, and even then new comments will appear but not move themselves to the top of the list. I tried deleting cookies (through the forum page's specific command) hoping they would recreate themselves properly but behaviour didn't change. I'd really like some help here. It's very difficult following responses without the comment tracker. EDIT: Just tried firefox, same situation.