mount authentication problem

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http://crunchbanglinux.org – I have a problem with my Waldorf installation. This has only started over the last few days. I am running a completely up-to-date Waldorf with awesome as window manager.I am now unable to mount other partitions either in Thunar or Nautilus. I get an authentication required message. mount shows the partition as mounted: /dev/sda6 on /mnt type ext4 (rw,relatime,user_xattr,acl,barrier=1,data=ordered) yet I do not see it as mounted in thunar or nautilus. If I start thunar or nautilus as root I don't even see the drives.Any idea about how to access that partition? (HowTos)