This new update addressed several users reported issues:
1. Fixed the “search menu disappeared” bug
2. Fixed the “undefined” tag bug http://groups.diigo.com/Diigo_HQ/forum/topic/1092
3. Fixed the occasional “fail to bookmark” issue for some users (related to particular user setting)
4. Fixed the “clip video” bug when it’s displayed on a multi-frame page. http://video.google.com/videoplay?docid=1104646951102176464
Thanks very much for our active users’ kind help and bug reports to allow us to make Diigo serve you better!
Diigo 
Still conflicts with Gmail Manager extension! The detailed description is here: http://zhoucaiqi.com/blog/read.php/587.htm
And I have report this bug in https://blog.diigo.com/2007/07/22/toolbar-102007072200-change-logs/#comments
And firepol have report this bug in http://groups.diigo.com/Diigo_HQ/forum/topic/1085
Thanks. We’ve added to our to-do list.