mounting CIFS share appears to work, but then prevents writing after a few seconds

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http://askubuntu.com – I've got a NAS that is setup with CIFS and open guest access. I mounted it in fstab with the following fstab line: // /media/freenasbox cifs guest,rw,noperm,iocharset=utf8,file_mode=0777,dir_mode=0777 0 0 which appears to work great. I've got read/write access. However, I start up Transmission and try to download to /media/freenasbox and it appears to successfully download a file for a few seconds, then gives me "Error: Permission Denied" Also, when I try to create a folder/file in /media/freenasbox, nautilus shows it with a padlock over it, but I can still delete it. (HowTos)