GUI Login Problems post-restore

Yesterday, I restored a system from a dump tape (4.0F PK7).  The dump
tape was from a working system that was on our network about a year ago.
I was able to restore the tape successfully, and recompile the kernel
without any issues.  X even loads at the correct resolutions, and color
depth.

However, I am unable to successfully login to CDE as any user on the
system (including root).  I can login via text mode, and through
failsafe GUI desktop.  When I try to login to CDE, the system hangs at
the blue screen.  I've tried numerous things, all of which failed.

.dt/errorlog.old shows this:

Workspace Manager: I/O error on display:: :0.0

=========================================

.dt/startlog shows this:

--- /usr/dt/bin/Xsession starting...
--- Xsession started by dtlogin
--- Starting the checklist setup
--- Reloading host access via dxhosts
--- sourcing //.dtprofile...
--- sourcing /usr/dt/config/Xsession.d/0010.dtpaths...
--- sourcing /usr/dt/config/Xsession.d/0020.dtims...
--- sourcing /usr/dt/config/Xsession.d/0030.dttmpdir...
--- starting /usr/dt/bin/dthello &
--- starting /usr/dt/bin/dtsearchpath
--- starting /usr/dt/bin/dtappgather &
--- execing /usr/dt/bin/dtsession with no profile...
--- Starting /usr/dt/bin/sdtdbcache -init
--- Starting /usr/dt/bin/ttsession -s
--- Starting /usr/dt/bin/dtsession
--- not sourcing //.login (see //.dtprofile)

=============================================

I also verified that the sticky bit was set on the correct dt files:

# find /usr -fstype ufs -perm 4555
/usr/dt/bin/dtappgather
/usr/dt/bin/dtprintinfo
/usr/dt/bin/dtsession
/usr/dt/bin/dtterm


Any help is greatly apreciated.  I feel like I'm missing something
simple, but I just can't figure out what.

-Rob