I've downloaded the version 4.0rc1 and although everything seems to be working well, whenever a comment is written in greek with greek characters, there is a problem and the characters are shown as question marks (?). MySQL charset is utf-8 unicode (utf8) and I use the 1.5.15 Joomla version. In the !Joomla comment configuration in the local charset I've typed utf-8.
This component looks great! I hope you can help me work this problem out!