Passwordsafe screen disappears

Helo - I run Manjaro with KDE Plasma version 5.27.10. I recently downloaded and installed the new PasswordSafe app for Arch Linux as a flatpak installation. I transferred my PasswordSafe database to the computer and ran the app. It worked, bringing up all the old passwords. Then the behavior changed. Now when I invoke PWS the splash screen appears but disappears in 3-4 seconds. I have uninstalled and reinstaled PWS using the flathub directions but this behavior still occurs.

I am not a computer expert. I understand that I probably have left out details that would be relevant to solving this issue. I will appreciate any help I get!