[V184.108.40.206 - Windows]
I did video to show the challenge of V9 Rollover only works if window is activated.
Confirm this also true on the Mac.
TheBrain (Beta 10.0.14.0) 220.127.116.11, iOS V9.1.2, TheBrain 18.104.22.168
Windows 10 (V1803), Windows 7 SP1, OS X V10.13.5
Using The Brain since V3 (1999)