I have Alerts set up to notify me if comments are made in threads I am watching. I have noticed that if an extended time passes after I view a specific thread, I won't be notified of new comments on that specific thread. I didn't notice I was missing these comments until I went to the "new posts" and filtered on Watched because I was trying to find info in a particular thread I was watching. Low and behold I saw that numerous watched threads were showing up with comments, but I didn't get any alerts in the upper right bell icon. Does the forum assume I don't care anymore if I don't go visit a thread in a while? Any idea what that time threshold is?