X permission problems

[Mark Hepburn <mark_h@postoffice.utas.edu.au>]

I'm currently trying to set up X.  I have a working XF86Config, however
when I type startx (or just 'X') I get the following message:
X: exec of /usr/bin/X11/XF86_FBDev failed

I can start up fine by typing 'xinit /usr/bin/enlightenment --
/usr/bin/X11/XF86_FBDev' as root, but cannot of course do the same as a
user or fakeroot.

What am I doing wrong?

(one other thing; X seems to work fine with both 16 and 32 bpp; however
after shutting down under 16 the screen is filled with the following message:
mach64CreateGC: unsupported depth: 16.  Using cfbCreateGC instead.
Can I do anything about this, or don't I need to?)

Thanks in advance, Mark.