I have seen similar problems with Array Viewer especially when I install its demo on computers where I distribute my programs. The solution was to start the Array Viewer once separately. So, my suggestions are:1- Run Per-User Setup from Start/Program/Compaq Visual Fortran 6;2- Run once Array Viewer from Start/Program/Compaq Array Visualizer, close it and then try to view your arrays from Dev. Studio.
Hope this helps, otherwise you can try to uninstall Array Visualizer and reinstall it.