A user reported an annoying bug in Sections series of orchestral instruments. It will be fixed on the next update. Only happens with empty layers and can be easily fixed - it is just annoying!
the report on GitHub:
"There's a strange bug when using a preset that doesn't have certain layers touched already or when initializing from default or zero will not accept midi input. A newly added layer won't accept MIDI input until the MIDI input field where you can set the channel it accepts input from is clicked. You don't have to enter a new value, you just have to left click on the entry field and it will start accepting input. I was pulling my hair out over this thinking I was doing something wrong until I found out it was a bug the whole time lol. This also applies to your other HISE plugins that use the same system like WINDS, PERC, and BRASS. "
Reported by Someone65 Gif animation of the situation: https://gfycat.com/zealousanguishedgazelle