Komplete Kontrol worked finde here in version 3.21.
After updating to Komplete Kontrol 3.40, I can no longer start it at all: it always hangs during the startup scan, with the same plugins and plugin folder structure that was scanned without problems before.
NI's hilarious support page advice to remove every file showing up in the startup freeze one by one must be a crackpot level joke, wasting lots of time solveing a problem they created in the first place, when they simply messed up with a newer version of the app, while the previous one worked fine.
So I request to solve the issue by a timely(!) update.
For the time being I have no other choice than to remove Komplete Kontrol and all its folder content completely, and reinstall version 3.21. Not great!
By the way, my actual effort to create a support ticket was a nightmare experience with a stupid support bot, which at no point confirmed that a support ticket was created, offering incredibly stupid "solutions" before even pretending to connect to real support.
I found this to be on a subterranean level of bad quality support, and will heavily rethink my NI customer relation, hesitating to buy anything from a company with that dysfunctional level of connecting to support.