Manager stopped working since appimage update

You could have searched forum and found discussions such as at AppImage fails to load "stack smashing detected" - #15 by krystalsavage

The issue seems to be with Linux newer versions using for example with Ubuntu “Yaru gtk4” rather than “gtk3”. You should thus follow the instructions in the forum or Google how to downgrade to gtk3 and keep that locked so that it doesn’t get changed again when running a Ubuntu Server update.