Can't Mount USB Drive As User Under FreeBSD 10

[B J]

I searched the mailing list archives for an answer to my problem but
didn't find anything.

I recently installed FreeBSD 10 on a T42 Thinkpad.  The configuration
uses Gnome as the desktop.

I've had problems configuring the machine to mount external USB
drives.  I can mount USB thumb drives when logged in as root using:

mount -t msdosfs -o -m=644,-M=755 /dev/da0s1 /mnt/root

after creating the directory /mnt/root.

It appears that external USB hard drives will automatically mount on
the desktop while I'm operating as root as well.

If I try the "mount -t msdosfs" command for a USB thumb drive while
running as a user, I get an "operation not permitted" error.  External
hard drives won't mount at all.

I followed the steps given in section 18.5 of the handbook and I even modified:

/usr/local/etc/PolicyKit/PolicyKit.conf

in accordance with Step 2, Section 3 of:

http://www.freebsd.org/gnome/docs/halfaq.html#q3

Nothing seems to work.  What did I do wrong?  Did I miss something?

Please advise. Thank you.

B. M. Jatzeck