B800FS Sub directories / Subfolders not showing up

I regrettably had to upgrade my system to OS X El Capitan (10.11.3). My B800fs now shows up under by shared category in Finder as a question mark. When I try and access it, it takes a while and I only get the root directory folders showing up. If I click on any, nothing shows in the subfolders, which is not so. There’s plenty there.

Any idea what is wrong and how to fix this? My other systems on the network can see the subfolder contents just fine.