Build 21277 is out as an Optional Update

On my primary system right now so can't confirm exact number but was either 457.51 or 456.71 offered through Windows Update.  I had been running the 460.20 over the last few updates and that driver didn't allow me to change to higher refresh rate, the older one did.  I didn't try the newer one from Nvidia on my Insider one, but am running that version on my Primary system with no issues.  I will have to boot back to the Insider drive and try the 460.79 one.

edit - running 456.71 from Windows Update, was running 460.20 and was offered the older one as an optional driver "update"

edit 2 - Now running newest driver from Nvidia 460.79, am able to run my 240 Hz refresh rate with no issues.

@David Vair, 

Just F.Y.I.

There is a bug in Skype that was introduced with Nvidia Drivers 460.79 and 460.89 (Now with Hot Fix 460.97).

I could reproduce the problem consistently with my Dell XPS 8930 and Nvidia RTX 2060.

I had to go back to Driver 457.51 to eliminate the problem.

See my last post on this thread:

Video on Skype turns to black and white after a couple of seconds - Microsoft Community

System (process) /  ntoskrnl.exe is Crazy !

Yes, always glad when & if I don't have to see or look at it blurry.  When it was blurred I, of course, just put up with it.  Actually, now that I'm brought to thinking about it... it didn't pay attention to the settings then, either, which is why I just lived with it.

Then, one day... 😊

BUT

One BIG reason I didn't delve into it was there was a known inconsistency with it, for a while; from the developers, I mean.  They did change back and forth a bit with this one; at least that was my understanding

Cheers,

Drew

5. I hadn't given this much concern before this discussion.

Cheers,

Drew

On a bright note, if something is actually broken, it works in your favor of clear rather than stuck on blur.

That would be frustrating  :-)