Oops, not MP4 files, but M4a files. Anyway mixx has crashed allways while rescanning a different MP3 file (The format I use most often), file format seems unelated to me.
Oops, not MP4 files, but M4a files. Anyway mixx has crashed allways while rescanning a different MP3 file (The format I use most often), file format seems unelated to me.