Cannot create files in shared folder

I have a shared folder for Fedora 9, running on top of Xubuntu 14.04. The virtual Fedora can read files, edit files, and delete files, but is unable to create files or directories. Being root does not help. Any suggestions?

Update: After a reboot, I now get a popup from SELinux after an attempt to create a file. I am guessing that the NSA is the root cause here.