There must be something else to it, I couldn't recreate both above crashes. Here's a nitpick of which I don't know with which of the previews it started to occur: The MIDI editor always scrolls it's view to the edit cursor, so if you open an editor window for an item elsewhere than the edit cursor, you have to scroll it's view to see the content. Having two seperate editors open for two items on different places on the timeline is no fun, if you don't use sync mode. Placing the edit cursor in one of them makes the other (inactive) window scroll to view the nice cursor and doesn't show my notworthy midi data anymore until I force it to (which does the same to the other window, of course). Also I think the 'auto scroll during playback' option should be seperate for the Midi editor, independent from the main view (if not in sync mode, of course). I always lose sight...