LJB,
Are you saying that VKFX plugs lost their auth so that they would not save their settings and you opened and saved projects containing these now un-auth'ed plugs ? So the VKFX custom settings in those projects were lost ?
Do you think this was caused by a Sonar update or a Windows update.
I noticed that the Nov 2016 update for Win 10 1607 de-auth'ed both my AD2 and Melodyne 4 Studio because the Computer ID was changed after the win 10 Nov update. I had to go online and delete and add back my PC for both.
This suggests that ANY plug or 3rd party program which relies on Computer ID for auth (including ones where there is a limit to how many instances are allowed) becomes un-auth'ed after the Win 10 Nov update.
Thanks for the heads-up and I feel for you, especially at the final mix stage.