The MediaBay default settings 'Scan folders only when MediaBay is open is unchecked.
Today I was sitting with an empty project for a bit just doing some testing, no recording or anything. Open MediaBay and realize that it didn’t complete the scan it started when I previously selected all my samples folders.
I am not sure if Cubase will keep updated with my samples library if I don’t start a new scan? Nope. Not sure if that setting is doing anything at all.