Most discussion reply links report "Page not found" when I click on them

I just joined this group, but as indicated in my title, many, many of the discussion reply links seem to point to nowhere.  I am viewing them on a Mac using Safari.  Known issue?  Thanks!

Welcome!

It looks like you're new here. Sign in or register to get started.

Welcome!

It looks like you're new here. Sign in or register to get started.