Addendum: in both Windows and Linux, the menu option for View -> Orthographic -> YZ actually changes the view to XZ, and vice versa. The option for XY works as expected, as does Ctrl+Tab. I'm not sure if this is related.
I'm running a fresh install of Fedora 37, and installed DarkRadiant 3.8.0 via the Flatpak installer. Trying to create a new XY view crashes DarkRadiant every time. I checked in Windows 10 and the same behavior doesn't occur. Are there any log files or other info I can present that might help?