Suddently we experience over the weekend to get an error saying "Internal Server Error" when trying to expand the PIM warehouse.
This has been working just fine, until today. As far as I know, no changes has been done.
Another strange thing is that we do not see the "Warehouses" setting under "Settings -> PIM".
I'm logged in as "Administrator" and we run DW 9.5.5.
Attached 3 screenshots.