Board Thread:Questions and Answers/@comment-29968465-20160914123603/@comment-27324770-20160924130042

So if the black box shows up (I'll look for a picture later) when you try to play the note, does it say something like "file load error"? That'll mean that something went wrong.

Also, check the oto.ini alias for に, as a space can actually mess it up. The same goes for that specific に in your UST.