VapourSynth preview no longer saves preferences

[sharkeylaser]

Every time I make a change to the VapourSynth filters and open the preview, the preferences for the preview screen resets. It sets scaling to fit, size to 8.00x, nearest neighbor, etc. And every time, I have to set the scaling to fixed, 1.00x, bilinear filtering, etc. I know this didn't happen in previous versions of Hybrid.
Using Hybrid 2025.07.27.1, Windows 11.

[Selur]

That does not happen for me.
Does it also happen for you if you completely deinstall and reinstall Hybrid?

[sharkeylaser]

Yes; completely uninstalled, no settings saved. Reinstalled, no settings changed. Still happens. Also worth noting, I had to reinstall Windows 11 recently, so it was a clean fresh install of Hybrid previously too. I believe the version prior to 2025.07.21.1 didn't have this issue. Also just tried with the latest dev build (2025.10.02-1800) and same issue.

[Selur]

Read the sticky, provide a debug output and I can look at it after some sleep. (24hrs awake at this point)

[sharkeylaser]

Thanks for looking into this! Rest well

[Selur]

One idea, lying in my bed, open vsViewer (Tools->vsViewer) and check under "Edit->Settings->Common" that 'Portable mode enabled' is disabled, assuming you are not using a portable Hybrid setup.

[sharkeylaser]

No, not using the portable version. In all cases, I've used the installer.
When I go Tools->vsViewer, I get an error message:

Failed to open the file J:/tmp/tempPreviewVapoursynthFile08_10_39_097.vpy.

I've never had a J: drive, nor have I set any paths to J: by mistake. My "workspace" drive is E:, so it should be E:. I also set the temp folder to E:\temp, so J:\tmp (without the "e") is very wrong.
As such, the only two lines of the script are:

import vapoursynth as vs
core = vs.core

Going to Edit->Settings, unchecking "Portable mode enabled", hitting "Apply" and "OK" doesn't seem to work; the checkbox state isn't saved and reverts as soon as I open the settings page again.

Edit: attached debug log from that just in case.

[Selur]

Does it make a difference if you move the vsviewer.config file out of the Hybrid/64bit/Vapoursynth folder?

Cu Selur

[sharkeylaser]

That has for the most part worked! It now is saving my viewer preferences. The only issue is, if I go to Tools->vsViewer without the preview window open, I get:

Failed to open the file E:/temp/tempPreviewVapoursynthFile13_09_06_554.vpy.

With the preview open, it will show the full script. I'm guessing the .vpy file doesn't get generated until the preview window is opened?
In any case, thanks very much for the suggestion! It's so much better not having to reset the preferences every time I open the preview

[Selur]

That popup can be ignored, by default vsViewer is configured to try, to open the last script it had open when it was closed, if that file does not exist the error appears.
Hybrid creates the vpy file just before opening it, but afterwards the file is deleted.

What did you do so that vsViewer remembers the settings again?

Cu Selur