I just installed 12.10 and noticed some strange behaviour every time I connect a USB storage device. It reports I already have the device mounted by a different user but there is only one user account on this set up.

Here is a picture of the dialogue:

Also when I try to mount the inserted USB drive, I have to enter gain root privileges before the device will unmount successfully. Like this:

.

I can't copy/delete any file without root access either with the default file manager or third party file manager, Marlin.

How do I resolve this rather frustrating experience? Thanks in advance.