Well, this is a first for me. I looked back in the post history until just after launch, but no-one else seems to have a similar problem.
I did a fresh install to a USB drive, updated, then tried to set up some basic files. I can't access the hard drive in the computer box at all nor can I copy files I need into my /home. Permissions seem to be normal, so I have no clue as to why this would happen.
Any ideas how to resolve this problem?