The same problem in my system.
- When I try to play files which contain certain Japanese characters (especially kanji), MC returns error message "this file could not be located."
- On JRemote, those files are displayed with parts of their information garbled (such as the artist name).
As a thinkable workaround, I imported an MC 27 library into MC 28 because this problem is not occurring with MC 27. But, this did not work.
I hope this will be fixed ASAP.