#qpdf 12.3.0 was released a week ago and it looks like there is an incompatibility or bug which renders PDF Arranger useless (you can't save your results).
Workaround: Downgrade (or don't upgrade) your qpdf. The flatpak should also work fine if that is an option for you.
qpdf is a great library and well maintained by the way, I'm sure we'll have this resolved very soon.
#qpdf 12.3.1 has been released with a fix, #pdfarranger should be working fine with any qpdf except 12.3.0 (as long as it isn't too old 😉 )
Credits to "m-holger" on Github, I'm merely bringing the good news 😊
Edit: The update is on its way to stable, no further karma needed. :)
Is anyone here using PDF Arrager on #fedora43? If so, please test and give karma to this update if you can:
https://bodhi.fedoraproject.org/updates/FEDORA-2026-25d54f90fa
PDF Arranger