I am using LO 220.127.116.11 Writer with Linux Mint 16 Cinnamon. I just tried searching for quotation marks (‘ and “), and can’t find either type. In a file that has plenty of both, every time I try a search for either I am told that none was found. I can’t recall whether I have searched for them earlier, so I can’t say whether this is a new bug or not.
I have no idea whether this is a bug or a problem with regular expressions, since I don’t have a list of the latter for LO. I don’t think that’s the problem, since it makes no difference whether regexps are turned off in the replace dialog.