A couple of my users have gotten this error message after upgrading from Notes 5 to Note 6.0. The error is "Context toolbar not found. Bookmark design needs update."
I have updated the bookmark file with the template supplied with the Notes client, but it did not fix the problem. I finally deleted the bookmark.nsf file and allowed it to be recreated, which worked.
I saw in the beta forum that I should update the template, and then go into the toolbar preferences and to check "restore defaults". (From
http://www-10.lotus.com/ldd/nfr6forum.nsf/55c38d716d632d9b8525689b005ba1c0/98ca3edfb01143d985256bfa00549f34?OpenDocument).
I'll try that next time, but I wanted to post in case others had the same problem.