This is not new to 3.0, but has come up recently in my exploring. When using dashes, single-quotes and double-quotes in searches, MB can only find the "plain" version of the mark. It won't find "smart quotes" in my tags using the quote keys, and it can't find whatever other kind of dash there is that looks exactly like a normal dash but isn't (in the search box, quotes don't really work because I think it's looking for a phrase, but try a custom search). In any case, these seem like things that MB should be able to search for together, just like it can find diacritics. I can provide some example files, if needed.