I must be doing something out of order.  When I attempt to open multiple view ports to begin marking or referencing, the program generates errors and crashes. Any input would be welcome.
Bruce

Please contact support at support@realviz.com

Same thing happens to me.

sames problems .. but arranged with new driver openGL for my card ...
but reponse from RealViz Support... possible solution :
 
\"This is not an ImageModeler bug. It seems that the driver of your graphic
board does not support multiple openGL viewports. You should either find a
more recent driver or you can ask ImageModeler to use openGL without
hardware acceleration (but in this case it runs much slower).
 
What is your graphic board and driver? (right click on the background of
your display and select Properties, then open the \"Settings\" page and press
the \"Display Type\" button.
 
If you wish to avoid the openGL hardware acceleration:
 
1. run rzglpf.exe
 
  In the list \"Window Format\" get the number of the format \"... Software
RGBA 32 Double Z32 ...\" (this number is displayed in the first column).
 
2. run regedit
 
Select HKEY_LOCAL_MACHINE/SOFTWARE
do: New:Key \"REALViZ\"
open REALViZ
do: New:Key \"ImageModeler\"
open ImageModeler
do NewWORD Value \"OpenGL Window Format\"
 
set \"OpenGL Window Format\" to the value got from rzglpf
 
(attention! select the option \"Decimal\" in the Modify window)
 
The case and the spaces are important.
 
If after patching the registry you don\'t have the problem any more, it means
that the problem comes from your driver. If you update your driver, remove
the registry key you have created in order to get the default settings
(hardware acceleration).\"
 
good day ...

This issue is generally due to the driver of the graphic board not up to date. So, in NT4, the solution is generally to upgrade your driver from your graphic board provider web site. In W2000, drivers seems to be less stable than in NT4, that\'s why this solution is less working than in NT.  
The solution given in the answer from Cedric Nevians consist on disabling the hardware acceleration of the graphic board. The result is slowing the application, but it can be done as last solution.
In any case a new version of ImageModeler, coming soon, should solve this particular problem.

Where does one find rzgplf.exe as described in the above possible solution?

Where is the file rzglpf.exe?  I have problems with the four viewports.  Blue screens on the three windows