I’ve just found an unusual little bug. If you select some songs in the setlist by clicking the top one, then holding shift and clicking a lower one, and choose “Re-assign program numbers”, “Only selected” and choose a starting value, it does what you expect. But if you choose a song low down, then hold shift and select a higher one (i.e. making a multi-selection from the bottom up), and do the same re-assignment, the numbering goes weird - the bottom song gets the first number, then the top one, then the second down, and so on.
Harmless little bug, but peculiar…
Neil