“Save” button becomes disabled when trying to save without any data and remains disabled even after entering valid values for all fields

I’ve observed this behavior while adding User and User Groups and may probably be the case in other forms too.

That indeed does seem like a bug, we’ve created an issue on GitHub about it and will investigate further - https://github.com/xibosignage/xibo/issues/1589

Thank you for bringing this to our attention.