You may have noticed a artifact from the migration from Plinkit on your navigation portlet. By mousing over the title of the navigation portlet the site description text is displayed. This can be removed or changed by editing your sites description.
Changing or removing your site description
1.) Login to your library Ploud site using a user who has "Site administrator" permissions.
2.) In the upper right corner where your login name is displayed select "Site Setup" from the drop-down menu
3.) Now select the "Site" Option
4.) On this page under the field 'Site Description" edit or remove the text.
5.) Select 'Save" at the bottom to put the change in effect.