I've tried a few times and it's been consistent.

I opened the Edit->MultiRiff dialog (I wanted MIDI regen, but it's not there), clicked [Help] ... nothing, clicked to Windowws [X] close ... nothing.

[Close] closes as expected.


Jazz relative beginner, starting at a much older age than was helpful.
Kawai MP6, Korg M50, Ui24R, Saffire Pro 40.
AVL:MXE Linux; Windows 11; Win8.1: Scarletts
BIAB2022 UltraPAK, Reaper, a bunch of stuff.