I dont know if this thread is still active, but if so, here is the problem: The U3 wants to use the later IDv2 tag system, rightly as this offers more options to the user. If your song only has an IDv1 tag, it will use that, but many IDv1 tags are written using the later unicode char set, which the player cant read, so it resorts to some sort of Chinese default. The simplest and most permanent fix is to give your song an IDv2 tag using one of the common editors. I use Audio Tag Tool on Linux. I am sure there are many Windows alternatives if that is your flavour.
Seems a shame to slam this great little player when it is only trying to be 100% up to date :-)