The latest beta release (4.2.1 release4) for the Slate-AXT removes installed packages & breaks all sources. I went from 4.2.1 release 3 to release 4, with the keep settlings option enabled.
Downgrading back to 4.2.0 fixed the issues, sources worked again & I could reinstall the packages which got removed.
Just thought I’d let you know, latest beta seems to have some problems😄