Joe,
not sure how the interns I use are logged in. I give them the netgear password and they are in.
The folder is added by me with the + button in shared folders, file sharing area.
Sometimes I have this issue, and it usually is resolved by changing permissions, but this file was definitely a read/write.
She is first intern on windows. Luckily all previous interns have all had Macs thus far. I "assume" that could be it.
She's comes back in a week and then we'll test this on other files and report back. feel free to pipe in with any ideas.