Now I'm working with LibreOffice 3.4 final (italian version)
Searching some text in the current sheet, works flawlessly.
Searching the same text with the option "in all sheets" just find the occurrence of that text in the current sheet only.
With LibreOffice 3.3.2 final (italian version) I didn't have this problem.
It's related to use of FindBar. Already reported.
*** This bug has been marked as a duplicate of bug 33379 ***
RC2 is bit by bit identical with release version, so separate items in the version picker are useless. Changes have been discussed with Michael Meeks.