[LotusNotes] Toolbar configuration not found. Context toolbar not found.

When you changed your Notes client version,  i.e. from v 7.0 to v 8.0. You may face the question like title description. you can operate like this, find you Notes install folder,  select "Data" folder, "Delete the cache.NDK rename your current bookmark.nsf to bookmark.old and restart Lotus Notes. It will create a new bookmark.nsf, obviously you lose your old bookmarks."  that will be ok.