Backtrack users only have one option when it comes to logging in and that's the root account, this saves typing sudo every time you want to run a privileged command but has it's down sides to.
some applications refuse to run on a root account TOR being one of them you open it up and get a snotty error message stating you shouldn't run as root this is dangerous blah blah.....
There is a way around this however download the TOR browser bundle from
here and extract to wherever you like.
Browse to the extracted folder and open up "start-tor-browser.sh" in a text editor Kwrite,nano etc. and find the line:
if [ "`id -u`" -eq 0 ]; then
around line 110 if my memory serves....
There are two ways to proceed now (either way make sure the file is backed up)
either change
if [ "`id -u`" -eq 0 ]; then
to
if [ "`id -u`" -eq 1 ]; then
or delete that entire if block, this has been known to cause some issues but worked in my case. save the file and you will now be able to run as root.