Since you say you had a delete link, that must have come from some contrib or local module. Standard core is reply and edit.
Assuming you were just mistaken about the links, first make sure that comments are marked as read/write for the content type.
The next thing I would do is code a simple module with hook_link_alter and very low weight (e.g. 100) to see if they are even being created or getting that far. Assuming they are, then you can go hunting for which module is destroying them (perhaps in a preprocess function).
Nancy
Injustice anywhere is a threat to justice everywhere. -- Dr. Martin L. King, Jr.
----- Original Message ----
From: Benjamin Jacob
Am using drupal 6. Don't know what went missing where but I can't see the reply/delete links in my comments on the node pages.
I am certain I had these links available at some point of time. Not sure what things have changed during the past few months.