I have no idea when this happened (I've been trying to fix Mollom + PostgreSQL, to the point where I tried, and removed, some core patches), but when I go to Content / Comments / Unapproved Comments (which leads to
admin/content/comment/approval) I get a 410 Gone error.
Was this supposed to be a view? How does one recreate such core views? Is the link the result of some module long since uninstalled?