A couple of things to check
That report makes it sound like one of your displays is connected via the integrated GPU, and the drivers in use are from 2021.
The latest drivers from Intel are here
Does your 2060 have two display ports?
If so, just check that both monitors are connected via the same GPU (and not connected to the motherboard); there are often issues with second screens and multiple rendering devices.
Intel UHD 620
06/01/2021
27.20.100.9664
I’ve been using SketchUp 2023 at least every weekday, roughly 9-5 since its release 21 days ago.
This blackness has only happened to me once now.
There is a driver update available that was released on February 8th that I am installing now; Let’s see if I get the blackness back…
The 2060 has a 1x display port and 1x HDMI.
My “main monitor”, monitor 1, which had the SU modeling window turned on, is connected to the HDMI port.
The second monitor that had the tray covered is connected to the display port.
The third monitor is daisy chained out of monitor 2.
Monitor 4 is connected to the integrated graphics via DisplayPort.
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It could be that Windows is making bad decisions for you. I suspect those black boxes are due to those areas being rendered in OpenGL on a different device than the main screen. You can always check that SketchUp is specified to run on the 2060 always.
This screen is in Windows settings.
I think there is also an equivalent setting in the NVCP
EDIT: Lots of monitors! 
That makes sense, I thought I was reading something wrong when I saw so many monitors.
Can you use the Nvidia card’s HDMI port instead of the Intel one?
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Good call Adam, forgot to update System>Display>Graphics for SketchUp.
For me it has not been a problem.
And if it happens again, it’s easy to solve within my workflow: I have shortcuts to turn my floating trays on/off, turn the black tray off, and turn it back on, the black is gone.
It sure is more of a problem for others.
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Yeah, looks like you’ve got it under control.
Computers are hard.
Oh!
That’s new to me, how did you fix it…?
curious in Settings>Updates seems to suggest that I’m not on a preview build, ie there is an option to join…
Ignore me, that’s my mistake. 22621.1.ni_release.220506-1250 is the preview version, which is not what you have
DxDiag MWDS 20230310.txt (127.0KB)
Thank you for the suggestion to obtain this information.
The tray/toolbar problem is also in Layout. Mine doesn’t show black, it just can’t be positioned correctly and it moves around as responsible for my actions. That is, if you mouse-grab it in the header, by the time you leave the native screen, the cursor position in the header changes drastically, and in many cases, the tray/toolbar is missing, not visible on no screen. The only way to recover (in the case of a tray) is to create a new tray and assign the missing tray function. I just tried to capture this on video, but the trays don’t show up on the screen (I think this is a limitation of the X-Box app).
87.3% of all percentages are made up on the spot.
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It’s actually 87.3481501% to be exact. 
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Clearly Timble isn’t going to do anything about it.
What or who is Timble?
The developers have promised a fix. It may come sooner or later.
I find it unacceptable that the Timble developers have not released a fix in a Sunday Monday at midnight too.
How dare they. That would not happen with Thimble.
Haha… My apologies Nimble… The matter has dragged on for more than the weekend. We look forward with bated breath. 
