Have a look at this blog post: http://community.qlik.com/blogs/supportupdates/2014/04/25/known-issue-with-chrome-update-34018471nn-and-bookmarks . Might help.
Do you have any screenshots?
What version of your browsers are you using?
Thanks for the blog post. That's exactly the version I am running (Chrome Version 34.0.1847.116 m specifically).
According to the post this affects the Chrome versions 34.0.1847.1nn
Attached are screenshots
Attempting to create a second bookmark
According to my tests, it seems this affects both Adding and Deleting bookmarks.