What Happened to The Comment Trails

Ok there is a blogger mystery that's got me stumped.  Until recently, when I posted a comment on someone else's blog I was given the option of following the comment conversation and would get alerts in my gmail inbox (since that's the email I use for blogger).  But now that option seems to have disappeared.  There is a subscribe by email option that appears sometimes (but not always) - but it doesn't seem to actually do any thing.


Any one know what's up?  Do I just have top check on the original posts to keep up on the conversation?