macOS Mojave; Behringer X32 (with 16 channels activated over USB).
I can select audio input for a new track fine, but if I try to change the input to another one, the app reliably crashes, taking any unfinished work with it. Perhaps slightly more stable if no other apps are running, but this isn’t repeatable.
Will test on other systems with more-conventional interfaces (2x2, 4x4) as I’m wondering if this crash is specific to the X32’s multiple inputs.
Also (along with many others) concerned about whether ALK will be kept updated to address such things; if not, it is hard to recommend it to my student, who, nonetheless, adore it!