Problem displaying unicode filename

i have a file with the following name:

05 - ΠετροΛούκας Χαλκιάς - Σκάρος.mp3

all the unicode characters show up as blank spaces in Opus until i enter inline rename, then i can see them just fine.

why?

You've probably got the file display configured to use a font which doesn't contain those characters while the edit control (used by inline rename) is using a different font.