Hello Dave Kitchen, I am not involved in packaging kate, just trying to collect some more information.
You wrote you open via nautilus - so you are running a Gnome/Wayland desktop session? I tried to reproduce the issue in a Gnome/Wayland session but could not find a problem. In kate the native Gnome file open dialog opens and let me select a file and open it. >From my point of view kate should not be able to cause this, even if it wants to. Therefore I guess the maintainer will need more information on this. When you open kate from a terminal could you collect its output e.g. script -c "kate" -a kate_$(date +%Y-%m-%d_%H-%M-%S).log Are there relevant entries in the system log e.g. journalctl --no-pager Does this happen also with another or new user at this system? Kind regards, Bernhard