Frames are not properly display in notes cliets

my some of the lotus notes cliets does not disply some of the frame. It promt that Unable to display. what is the causes and how can i solve this issues

Subject: Frames are not properly display in notes cliets

Is it the Frames in bookmark.nsf? Try re-configuring the bookmark home page on each Notes client.

Frame will not display contents, if the database being reffered is not available/accessible.

Regards

Litty Joseph