Hi iamico,
Have you somehow by mistake have multiple identical plugins installed on your computer? I assume you has'nt, but just in case.
Duplicates can create different kind of issues.
Komplete Kontrol is VST2 only just like all NIs plugins are VST2. So you use the V-Collections VST2 versions in Komplete Kontrol. You don't tell, but i guess you use V-Collections VST3 versions, when not opened in Komplete Kontrol.
I suggest you switch VST3 support off in Studio One and restart Studio One, and check if V-Collection VST2 versions work.
Then afterwards to check if something was wrong, with the VST3 support, then switch the VST version on again and restart Studio One. Then try V-Collections VST3 versions.
You can switch the Studio Ones VST supports off and on in "Studio One/ Options/ Advanced and the tab Services - click the button with the warning after you have read the warning. Click the service you wan't edit and click the dis-/ enable button and then say yes to restart Studio One.
I hope this will help.
As said, then i don't have any issues like this in Studio One 3 on Windows 10 version 1909.
BTW: I did'nt mean you should upgrade to VC7 just to be sure your VC6 applications was updated. But if you have upgraded, then you have more applications now, and the new applications is great.
About the verification, then i assume you at some point when posting enough does'nt have to verify anymore.
EDIT: Do you have Studio One Professionel or plugin add-on to Artist? EDIT END