I'm on Windows 10 using Cakewalk (BandLab edition, version 24.04.1), although I've also reproduced the issue in Reaper 5.92 so I don't think it's DAW-specific. Ever since updating to Kontakt 5.8.1, I've noticed certain factory instruments - all of them percussion - will receive from all MIDI channels when you first add them to the sampler, much as though they were set to receive from MIDI omni instead of a specific channel. Some examples include the Central Stage Kit, the Suburban Kit, and the Bongos. I've been using these instruments for many years and they've never behaved this way by default. Right after updating, I loaded a bunch of the working files for my current project and noticed they were all playing tons of random percussion notes - this turned out to be the cause. Some further info: all the instruments I've seen this happen with show their input MIDI channels in the instruments pane as "1 + Groups", "2 + Groups" etc. I found I can work around the issue by going to the Group Editor -> Edit All Groups -> and then changing the MIDI port in the Source section from "omni" to "MIDI: default". But I'd rather not go back through dozens of my old projects to make this change on every instrument that presents this problem, and it seems like a strange step to have to take in order to have these instruments behave as they used to. I first noticed this issue on my laptop (also Windows 10, and same software version for Cakewalk) after updating both the Kontakt 5 application and the Factory Library to 5.8.1 and 1.3.0 respectively. I then updated the library on my desktop, didn't notice the issue, but DID see it crop up again once I updated Kontakt 5 itself. So it seems to me that the application update is what's causing this. I then tried wiping out both the application and the library completely and reinstalling each from scratch; no dice, the issue was still there. Has anyone seen this behavior yet or have any thoughts on potential causes, or perhaps a simpler workaround? I'm assuming it's not intentional functionality but maybe there's something I'm missing. Thanks!