Created attachment 655934 [details]
Image corresponding to my second step to reproduce

Description of problem:

gnome-disks can't edit the mount properties of the unique partition (sdb1) of one of my disks. Yet, it works perfectly for a partition of another of my disks (sda5).

When trying to change mount properties of this partition, I have this error :
"Didn't find entry to remove (udisks-error-quark, 0)"

Which is weird, as my fstab looks okay to me:
-------------------------------------------------
#
# /etc/fstab
# Created by anaconda on Wed Nov 28 19:01:14 2012
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=7fc7b844-275c-43b3-a5f7-9f507f121b58 / ext4 defaults 1 2
UUID=8008b77b-527f-4e36-b10c-d379d303385c /boot ext4 defaults 1 2
/dev/sdb1 /mnt/Games ntfs  0 0
/dev/sda5 /mnt/Data ntfs 0,x-gvfs-show 0 0
-------------------------------------------------


Version-Release number of selected component (if applicable):
Nom                 : gnome-disk-utility
Architecture        : x86_64
Version             : 3.6.1
Révision            : 1.fc18
Taille              : 4.6 M
Dépôt               : installed
Depuis le dépôt     : koji-override-0


How reproducible: I don't know exactly, but the error appears systematically on my system.


Steps to Reproduce (on my system):
1. Open Disks
2. Go to the partition (sdb1 in my case)
3. Choose "change mount options"
4. Change something and validate
5. Enter root password as required and validate
  
Actual results:
The error appears.

Expected results:
The fstab file to be changed accordingly.

Additional info:
Don't hesitate to ask for more information.