An anonymous user writes "When attempting to open a syncing folder, file manager asks for root privileges and opens to "/"". Further debugging/investigation indicates that xdg-open is failing to identify and launch the user-specified file-manager. Notably, the behavior is only observed when running the PyInstaller-based binary distribution (in other words, the file-manager launches expected when running as a standard python application from source).

This suggests that there's some deeper issue with how PyInstaller handles subprocesses in relation to the underlying shell environment, however, more debugging/investigation is needed...