Every night a new pre-release version of Squeezebox Server is built from the very latest software that's been updated by the development team.
This means that these "nightly" builds have the latest bug fixes and features added. It also means that there may be unfinished features and bugs. Officially, these version aren't supported by Logitech technical support, but are often discussed in our discussion forums.
If you encounter any bug or issues, please submit them to the bug database.