Yeah, well, I must have the magic Sonar, then, 'cause there was nothing there. Three tracks, one audio, two midi. Deleted bar 5. Left a 1 bar hole. With the same selection, delete special, delete hole, hole gone. (In other words, since I deleted the bar first, leaving a hole, there couldn't have been any info there when I deleted the hole.) Tried the same thing with cut and cut special, same result. However, just to check my theory, I turned non-destructive midi editing back on, and the same operations
still worked. So my theory's wrong. But delete hole still works, with, guaranteed, no information in the deleted zone. Thing is, I seem to recall having a similar problem right after installing X3, and unchecking NDME solved it. So...beats me. Divine intervention?