Chromium and VLC can’t be run as root. On backtrack 5 with default user root u need to make little modification to these applications.
Chromium
1. cd /usr/lib/chromium-browser
2. hexedit chromium-browser
u will get
hexedit chromium-browser
3. press tab (once) to switch to ascii mode instead of hexa mode.
4. Ctrl+s to search for geteuid
5. modify (replace) geteuid to getppid
6. Save changes by pressing Ctrl+X
search hexedit
gateuid to getppid
VLC
1. cd /usr/bin/vlc
2. hexedit vlc
do the same steps above
thanks to sumit