XnView Software

Yes, this one for instance works.

Yes, version 10.02.1 on Ubuntu 24.04 LTS

Very good point to suspect the pdfs: I did not realize that it seems to only fail for pdfs that I recently produced (I made a lot of illustrations in the recent months). They are produced by various recent versions of Inkscape, including 1.2.2 and Inkscape ...

Here is the part of the log that appears when I select a pdf which I randomly chose.
In the text below, I replaced the full path by [...]

######### CategoryModel :: checkAndSave()
MyView::set LOAD FULL [...]/xntest/3-set-0.pdf
BitmapLoadThread :: stop()
## BitmapLoadThread :: load -1 -1
## Bitmap ...

Thanks for your answer. I could not find the log.

Yes, from a terminal.

> gs

it opens and writes the following in the terminal and opens a white frame:

GPL Ghostscript 10.02.1 (2023-11-01)
Copyright (C) 2023 Artifex Software, Inc. All rights reserved.
This software is supplied under the GNU AGPLv3 and comes with NO WARRANTY:
see the file COPYING ...

Hi.

I get SVG thumbnails but no thumbnail for my pdf images. How do I activate this?

XnViewMP 1.7.2 on Ubuntu 24.04LTS.

In Settings>File list>Custom Filters the AI/PS/PDF "Visible" and "Show as thumbnail" checkboxes are checked
In Settings>View>Filter "Custom" is selected and "AI/PS/PDF" is ...