OK, I've dug some more and discovered precisely what's happening. We have FineTunedMac set to use the UTF standard for special characters. However, the characters that you're seeing as ? symbols in post titles are being sent out as ISO Latin. Even though UBB is using the UTF character encoding, it's still sending out post topics using ISO Latin, which is where the problem is coming from
Which, presumably, calls for UBB intervention?
