Using Lubuntu 13.10
Case sensitive search for contents is not working properly. The Case Sensitive setting for Name search is on by default but will apply to Content search eventhough the Case Sensitive setting under Content is not selected. Doing a Content search even if the Content setting for case sensitive is not checked will still result in a Case Sensitive search because Case Sensitive is selected under Name/Location search. Selecting Case Sensitive under Content will double up the Case Sensitive setting and equal a NOT Case Sensitive search.
I filed a bug about this but it was mutually cancelled as I could not reproduce the problem.