patricej

this has already been asked and answered.

they are legitimate.
they are also broken.

tech support is working this bug along with a few others let loose by the recent software upgrade.

in the meantime, in order to see which - if any - of your subscribed threads have been updated:

Go to either "Settings" or “What’s New”.

Next to the title of updated threads you will see a tiny teal circle with two little arrows.
Click on that to go straight to the first comment post you haven’t yet read.

I usually right-click and open it in a new tab on my browser.
That way I can just close that tab and go back to the list without starting that over.