I received a comment alert in a thread I subscribed to

when I click the alert, it opens the article and shows me it is no longer available to me (comments are not shown).  This started happening to me a couple of days ago with some articles.  Right now, I am trying to read a comment for LILAK but am locked out.  Again, this has happened several times in the last week and never before.  I believe, I am entitled to read the comments as I am receiving notice in the alert area which I have subscribed to or have commented.  Thanks for fixing this.