I found another bug in beta.10/beta.11: I refactored the settings configuration code in beta.10, which can cause this issue:
Error: code ENOENT: ENOENT: no such file or directory, open '/ps/config/PhotoStructure/settings.toml'
The prior behavior defaulted writing settings directly into /ps/config, but beta.10/11 wants to write to /ps/config/PhotoStructure.
This will be fixed in beta.12: sorry for the inconvenience!