The problem with scratch not responding seems to have popped up again over the last few minutes
we have contacted a user that was dealing with a lot of files and suggested him to use local storage or fast scratch (same use case as this issue : Scratch Disk I/O Saturation)
Any user dealing with a lot of small files are concerned too and can try the suggestion on this post too. This will greatly enhance the user experience for everyone.
Sorry to raise this again.
Scratch is again not responsive on Baobab (as of 15:00).
Baobab scratch is back again
It should be working again.