[Plugin] DMSGuestbook invible

Hello
Sorry for my English. I only speak french.
DMSGuestbook works well for a month.
This morning I changed the configuration so that the administrator read the messages before but DMSGuestbook (config) is now invisible. But DMSGuestbook is activ and enable.

I uninstall and install again but nothing…

can you help me please?

http://wordpress.org/extend/plugins/dmsguestbook/