This is occurring on a system at work that's not one of my profile systems. Mac Pro, OSX 10.9.5, MC 8.5. Connecting to a Terrablock. This had worked perfectly for multiple versions before.
When I have shared volumes mounted, all codecs in Media Creation are greyed out. Trying to import gives the error "There are no media drives available. You will only be able to import shot logs."
When I do not have shared volumes mounted, all works fine.
I use mostly linking anyway, so I can still keep working. However, I use import for a few things, and it's frustrating to not be able to import, and not be able to select my render/mixdown codec. That's the bigger annoyance - I'm stuck with DNxHD-145 / 115.
I can consolidate, transcode, mixdown, render, etc. just fine to the read/write volumes - but can't import, and can't change my Media Creation settings.
New user settings do not resolve the issue.