Hi,
I'm on Windows 10.
I know nothing about Machine.
I have the Komplete Kontrol software, and i have'nt issues it look like.
I use Arturias own preset system outside Komplete Kontrol.
Are you selecting presets in Komplete Kontrols preset selector or inside the loaded Arturia application, when you get the issue?
NKS presets and the presets Arturias software use are not the same files.
So when you talk about the database file, then is it the Arturia or the Komplete Kontrol file? It won't help on anything if you delete the wrong database file.
You talk about V-Collection 5 and V-Collection 8 presets. Which presets do you talk about, and how can you tell it's the one or the other? Do you have the same preset twice - one for each V-Collection?
Do you have both V-Collection 5 and 8 installed so you have multiple installs of the same application version - like dual installs of mini V3?
Be sure you don't have multiple installs of the same applications, that is to be found in both V-Collection 5 and V-Collection 8. Ie Mini V3 is the same application in both collections, and you can get issues, if you have multiple installs of that including it's presets and other files.
If an application has been updated from ie a V1 to a V2 version, then they might not use the same presets. In that case you do need to have both the V1 and the V2 version installed.
Keep in mind, that V-Collection (VC) is'nt the same as ie V2 and V3. The V is a version of a single application in the VC.