First thing I would do is check Admin > Wiki > Maintenance > URL Conflicts and make sure that you only have one page named "Mod Repository". If there are two, you might be viewing the one that has no contents.
At the bottom of ?do=list there should be a section with "Show", "Sort Items by", etc. If "Show" is not set to "Any Page Content", try changing this filter. If you get results now, probably the current area settings don't match your needs. In Admin > Wiki > Structures > Area Manager, check the settings for "Mod Repository". Under "List Options", make sure "Start by Showing Only" is set to something more relevant to the area. If it is set to anything other than this, and the area doesn't actually contain a match, you won't see anything. One gotcha for this setting is that any page that is used as a Book Chapter does not count as a Normal Page.
If neither of these suggestions helps, please submit a private ticket so that I can view the affected non-public area and check its metadata:
https://www.vaultwiki.org/members/?do=tickets