Orca’s Heart not displaying jack assignment

Not the most terrible bug, but:

I’ve got voice 3 going out to jacks 3 and 4, as shown. Voice 7 is sent to jacks 7 and 8, but jack 7 just has a black circle, I can’t see the number 7.
Maybe it’s just black on black?

Ah, yes the 7 isn’t legible. I’ll fix that.