I've exported a project as a MIDI file, and although I didn't save the project after this export, it won't display the Beatbox parts in drum score any more - viewed in drumscore mode all the notation is smushed up to the top of the grid. If I change "Mode" it won't show piano roll. The parts still play back OK. The workaround is to replace Beatbox with another instance, then change mode and it will bring up the part in the piano roll - but no drum score mode.
Has anyone else experienced this or similar, or know what's up?