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Ok, I've attached a screenshot.  Thanks for helping me troubleshoot this..

The first log I'm uploading (SVP native mpv) is from where I right click the SVP icon in the system tray and scroll up to "Open file via mpv..."  I click that, it opens up a window to choose a video file to play, I click on a video, the video starts, then pauses a couple of seconds, and then completely disappears.  That's it.

The second log (MPC Vapoursynth warning) is from when I open a video in MPC-HC.  The log I'm uploading though, may be one where the AviSynth filter is activated.  When I apply "prefer" to the Vapoursynth filter to MPC-HC the player simply crashes instantly and gives the error message in the "MPC-HC crash" screenshot I uploaded in the last post.  If you want me to try something else, let me know.

EDIT:  I forgot to attach the "MPC-HC crash" screenshot so I just added it.

Thanks for responding Chainik.  I have already tried everything you describe above.  I've attached screenshots of how I set the Vapoursynth filter (see Vapoursynth filter) and how the entire media player crashes after I did that (see MPC-HC crash).

As far a mpv bundled with SVP for SMPlayer, I've aready done that as well, to no avail.  (See attached screenshots 43 and 44).  Also, I've attached a screenshot showing that I've set the PATHs correctly in environmental variables (see screenshot 45).

If you read some of my posts from years ago I had problems with SVP not working with SMPlayer, but for the better part of a year or two, it's been working fine.  I have no idea what happened.  I changed nothing, and one day I woke up, fired up SMPlayer, and it stopped working.  I don't think the problem is with SMPlayer though, I think the problem is with mpv, because I can't even get the SVP internal mpv player to play a video, the video starts, pauses, and then disappears.  The standard fixes don't help, please don't say, just click the "set environmental variables for vapoursynth" in Utilities.  I'm way past that.  As I said, the whole thing was working for a year+  I'm not just setting this up for the first time.  What boggles my mind, though, is that doing a compete uninstall of SMplayer and SVP and then a reinstall still doesn't work.  If I were an SVP developer, I certainly would be intrigued and think of this as a challenge.  Please do and help.

I think the base and most important central clues to this mystery boil down to 1) The fact that I can't get a video to play through SVP's native mpv player and 2) the "RIFE only works via Vapoursynth!" error message in MPC-HC.  It would seem to me that the problem her is somehow focused on Vapoursynth.  But I'm not the developer of SVP, so I yield to you.

Still waiting on some sort of resolution to the issue discussed above.  I'm unable to use the product until some movement is made.  If you need me to run some more error reports or something I'm happy to do that but the radio silence here is deafening.  Somehow Vapoursynth is not working, I think that may be the common issue with MPV player not working either standalone or with SMPlayer and with the error message I get with MPC-HC. 

I asket ChatGPT how I could install Vapoursynth myself to perhaps solve the problem and Chat said NOT to do this because it could interfere with the built-in path configuration etc., that SVP uses.  Chat said to have the SVP "development team" instruct me on how to correct their product.  That's what I'm trying to do here and am unsure what the problem is.  If there is no solution to the problem then please at least respond as so instead of just ignoring the issue.

More info that might help:  SVP works with MPC-HC but when I try to engage the RIFE engine, I get a warning sign in the lower right of the screen that says, "RIFE only works via Vapoursynth!"

Does this mean that Vapoursynth isn't installed or isn't working?  I thought Vapoursynth was included with the SVP installation package?

Here's another piece of info that might help.  ChatGPT suggested opening the mpv player directly from the SVP folder and then dragging a video in there to see if t worked.  An it didn't.  It just paused and crashed.  Now this is interesting because SVP actually works with MPC-HC.  So perhaps it is something with MVP player itself.  It's confusing becuase it worked for a long time and I changed nothing.  Now I can't get it to work at all.

By "not working" I mean that the two full-SBS left/right videos are merging when I go into stereoscopic mode but they are not filling up the screen.  The top quarter of the screen is a big black bar and the bottom quarter of the screen is a big black bar.  Plus, the image is stretched horizontally by 2x.  It basically looks like the photo you posted above only the two images are merged and stretched horizontally.  This only happens with full-SBS videos like the one you posted above.  Half-SBS videos work just fine.  They fill the entire screen and don't stretch the image horizontally.

There is what they call a "Stereo-3D filter" in the video options menu of SMPlayer where I can change the video from full-SBS to half-SBS and get it to play like that.  But the idea is to not lose half the horizontal resolution in the process.  The reason I bought a 4K monitor is so I wouldn't have to do that.  The only other options in the "Stereo-3D filter" section are to convert it to anaglyph or interleaved, which obviously isn't going to help me.

I'm assuming that there are members here that play full-SBS videos using SVP on there laptops or desktops using either glasses or a glasses-free 3D monitor.  What would really help is if someone just told me what player they are using and how they have it set up.  Maybe nobody is or they are just playing half-SBS videos.  It would be nice to know.

Ok, maybe I should have phrased my question differently and asked, "HOW can I get a full SBS video to play on my glasses-free 3D laptop?"  Oh, and by the way, I made a mistake-- the resloution of the monitor is a full 4K 3840x2160 resolution, if that makes a difference.

As far as media players, I've tried just about all of them, potplayer, KM player, etc., etc.  With the exception of the built-in "SpatialLabs player" the only one I can find that will play a Full SBS video on the laptop is Stereoscopic player, but that player has other problems.  For one, I don't think it's supported anymore and isn't undergoing ongoing development.  Two, it doesn't support SVP.  Three, and most importantly, it doesn't have an option to speed up and slow down video playback.  This is why I use SVP, so I can slow down videos and still have smooth playback.  I'm not an expert in these matters so if someone knows of a specific player that works with SVP and can play full SBS videos or can just help me with a solution in general, that would be great.

P.S.  Again, the built-in SpatialLabs player has an option to play 1) 2D-3D conversion (on the fly), 2) half-SBS, 3) full-SBS, and 4) Over-under.  So the monitor can seemingly play ALL formats available within the player.  However, the 3D software package also includes another feature called SpatialLabs "GO" where you can play any video on the screen in stereoscopic 3D as long as you can get the video into fullscreen mode (e.g. a YouTube video).  From here, you have an option to do one of two things, 1) if the video you're watching is in 2D, you can click a button that will convert it into 3D "on the fly," 2) if you are watching a side-by-side movie, as in the one dawkinscm posted above, there is a button you can click that will merge the side-by-side images into a 3D image.  There's not an option that will merge a top-down or over-under video, which seems odd.  So I'm not sure if this may be part of the problem or not.  Again, I'm not an expert.

Problem solved.  Looks great.  Thanks!