The links in the views are incorrect and point a non-existing view.

user_stats_ips_by_user:
In field IP address: IP the link is admin/reports/ip_lookup/by_ip/[ip_address] and should be admin/reports/ip_tracking/by_ip/[ip_address]

user_stats_users_by_ip :
In field User: Name the link is admin/reports/ip_lookup/by_user/[name] and should be admin/reports/ip_tracking/by_user/[name]

I attempted to correct these errors but that makes the views disappear from the report menu (is that another bug?). So I reverted back an report it here without a solution.