Hi Colin,
I can only offer comments as I'm pretty much done with the Insider program based on my recent experience!
I viewed my efforts in tracing the problem as being part and parcel of my participation in the Insider Program (updates are every bit (sorry of the pun) as important as the functionality of a build) but, so far, you and only a very few others have appreciated the hours, no days, spent in doing so.....
I've said it before and I'll say it again... No warnings, no meaningful error messages, little respect shown for the Insiders struggling to discover the root cause of this problem, not a comment from a forum moderator nor a explanation from Microsoft participants here SHAME ON MICROSOFT!! Where the *1%^ is Jason?? His silence indicates that Microsoft just don't give a damn!
Despite numerous contributions here, and via the Feedback Hub, Microsoft have abjectly failed to acknowledge
A) that there is a problem
B) that they're working on it
.... or....
C) that this is the end of the road for the Nvidia chipset (and how many others?)
So, the question is... how many Windows 10 users are going to be stuffed when the Fall update is unleashed?
Well, assuming 1% of the user base are DIYers.... plus others with OEM PCs... how many other users on platforms, in addition to those with an Asus / Nvidia combination, will be impacted by this change? Bearing in mind that this will very likely have the same impact not just on drivers but on many 3rd party apps .... hmmm...
As of July 2015 the number of Windows 10 users was put at 14,000,000... many more today.... 100,000,000 + according to a recent count... so that'll only be a maximum of 1,000,000 DIY users then, all of whom are the more savvy PC users and who Microsoft would probably prefer remained Windows users...
Many of these PC savvy users like me support other Windows users (myself 30+) and, if this is not resolved, either with a graceful, layman understandable, EoL message and/or error report then it'll be a major headache for many less knowledgeable, PC literate, users.
Perhaps Microsoft knows the number of users impacted and is willing to cast them to the wind... if so.... Linux, iOS here I come with 30+ "clients"!
Cheers