Thanks, Peter.

With fast generation turned off, I have no trouble in cycling through the three songs.

When I turned fast generation back on again, I was able to play the first four bars of the first two pieces, but when I pressed "Next" at the 5th bar on the second one, BIAB hung - by which I mean that the menu bar at the top of the screen went white, the Title bar included "(Not Responding)" at its right hand end, and the cursor became an hourglass when hovering over any part of the BIAB screen except the title bar. It's not so unresponsive that clicking on the "Close" box doesn't work, however, which is different from the occasional Access Violation, which does require the Task Manager.

Incidentally, if I watch memory and CPU loads with Task Manager while BIAB is regenerating a song, BIAB doesn't seem to be overstretching the CPU or using much system memory - is BIAB being too "nice" for its own good, and being unnecessarily parsimonious with system resources?