When I log out Kubuntu unmounts two partitions

[Mike Bela]

This is a Kubuntu Edgy system with default install and with up-to date packages only from edgy-security and edgy-updates. No addons, no hacks...

If I log out from KDE the system unmounts two data partitions from /media.

I'm the only "normal" user on the system, I've never changed my privilegies and I've never touched the /etc/pmount.allow (there are no addon parameters after the comments).

The system unmounts the partitions when I log out (not when I log in again from KDM). This is not the the fault of KDM, because I replaced KDM with GDM but the problem still persists.

This is my /etc/fstab (I think that there is nothing uncommon in it):

/etc/fstab:

# /etc/fstab: static file system information.
#
#
proc /proc proc defaults 0 0

# /dev/sda1
UUID=d953f367-5210-4f21-b39a-3739ee44d126 / ext3 defaults,errors=remount-ro 0 1

# /dev/sda3
UUID=85400819-8c73-4730-ad62-af1b8f046b4f /media/sda3 ext3 defaults 0 2

# /dev/sda4
UUID=3558d932-7c29-41dd-b2e0-db57f8e09a51 /media/sda4 ext3 defaults 0 2

# /dev/sda2
UUID=435f62a1-e6c8-414f-8722-54c973fa2a74 none swap sw 0 0

/dev/hda /media/cdrom0 udf,iso9660 user,noauto 0 0
/dev/fd0 /media/floppy0 auto rw,user,noauto 0 0