Still a few problems:
1. a member who changed their display name was logged as changing it from "" [shows as blank] to "actual name"
2. a moderator changing member's display name was logged as setting (not changing) it:
e.g. "xyz set abc member's display from P to Q"
Might still be more, have not yet given this a real workout.
Messages are the sole opinion of the author, especially the fishy ones.