Quoting Ray, Stephen L:
> We are running version 3.0 and in the list of dependent bugs. Bugs
> that
> are in a verified state are struck through. We are running Bugzilla
> essentially right out of the box except for some extra flags. Is
> there something that could have been set when we were upgrading from
> older versions?

Resolved issues get marked with a strikethrough if the status is
considered a non-open status, as opposed to an open status. RESOLVED,
VERIFIED, and CLOSED are all considered non-open.

References to the styling:

This is controlled by get_bug_link, and you can change line 337 to check
if it is CLOSED instead of if it is non-opened.