It launches here ok for me. I don't use this, so not sure what/where the configs are saved, but might be useful to see if it still fails to launch if they are deleted.
Note: Possibly not related, but roughly in the timeline you have, krfb rebuilt against new pipewire (transition) landed. ** Changed in: krfb (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1899599 Title: krfb window not opening To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/krfb/+bug/1899599/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs