[ubuntu] USB flash drive doesn't appear on 12.04 sidebar and doesn't automount

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http://ubuntuforums.org – Hello everyone, Others have had this problem but I have failed to find a solution. When I put a USB 8 GB stick in the socket there is no notification icon on the launcher (sidebar) and the drive doesn't automount. I have checked using dconf-editor and the automout and automount boxes are both checked. Using dmsg or sudo fdisk shows that the drive is at /dev/sde. I CAN mount the drive manuallly using sudo mount /dev/sde1 /mnt/flash and read/write files without a problem. Moreover, if I plug a 500 GB seagate drive into the socket it doesn't present an icon and doesn't automount either. (Hardware)