I'm using the latest Flatpak version 97.0 on Linux MInt debian edition and when ever I try to save a simulation it causes a fatal error that locks up Powder Toy, and every other flatpak application.
I have tried saving a blank save but the same problem ocured, and saving publicly also did the same thing.
I have also gave Powder Toy acess to my whole home directory via Flatseal but the error still remained.
Thank you for the help, running the one from the download page worked perfectly.