debian stretch tigervnc issues

["R. Ramesh" <rramesh@verizon.net>]

Recently I got a nvme ssd and did a fresh install of debian stretch 
(amd64). In the new install, tigervnc is acting up. Commands like 
"vncconfig" and "vncserver" do not always work. Randomly, about half the 
time, commands just hang waiting for something and at other times they 
will exit without doing anything.  I do not have any idea why this is 
happening.

I usually fire off one vnc for each user account and we simply connect 
to one of them to use. This has become a pain now. We use a script vnc0 
:N below on an xterm to switch between different user's screen and it 
nolonger works reliably now

> #!/bin/tcsh -f
>
> if ($?DISPLAY) then
>     vncconfig -disconnect
>     set olddisplay = "$DISPLAY"
>     setenv DISPLAY :0
>     xvncviewer -FullScreen -FullColor $*
>     xvncviewer -FullScreen \
>         -passwd ~/.vnc/passwd -FullColor $olddisplay >& /dev/null &
> else
>     echo 'No current $DISPLAY. Trying :0'
>     xvncviewer -display :0 -FullScreen -FullColor $* || \
>         echo "display :0 not found"
> endif

My older install  (jesse, i386) on the very same machine (dual boot) 
works just fine, although I think it is xvnc4.  I need amd64 to install 
windows 8 guest.  So, I am in a bit of a fix.  Please help if you know 
what I am missing in my tigenvnc setup.

Ramesh