You may wish to revert all user dashboards to the default values if you are changing the design of your site, or if you want to suggest a better initial layout for your users.  To do this, you will need access to run a SQL script directly against your Telligent Evolution database.  Execute the following SQL script against your database, and all user dashboards will be set back to their defaults:

delete
from cs_ContentFragmentPages
where PageName = 'common-home'
      and ThemeTypeId = '294234B2-9505-40A9-A679-93162FD50C1C'
      and ThemeContextId <> -1

delete from cs_ContentFragmentTabs where PageId not in (select Id from cs_ContentFragmentPages)

delete from cs_ConfiguredContentFragments where PageId not in (select Id from cs_ContentFragmentPages)