I am considering myself as a lazy person, but ok.
The issue is related to used by ADE XL mechanism of running job process by calling vnc protocol. The vnc server starts to checking whether system has all necessary files to run it. The issue with Debian like distros is lack of xfonts as a defaultly installed packages. So, vnc server can't find fonts required to run server and finished his job. Thus, ADE process can't even start and generates any feedback to virtuoso.
The solution is to install packages xfonts-base, xfonts-75dpi and xfonts-100dpi.
In addition, old versions of virtuoso (<6.1.6) were compiled on older version of RHEL which has different xfonts directory structure. If your virtuoso version is old enough, you will need to create xfonts directory structure under path mentioned in your vnc log. Vnc log should be located in your home directory ~/.vnc.log or in ~/.vnc-logs/ (don't remember now). Such structure should be then located under sthing like /usr/X11R6/fonts instead of /usr/lib/fonts.
So do following:
1. Install (or ask root for this) mentioned xfonts packages
2. Try to run simulation
3. If doesn't work, look for ~/.vnc log file. Provide also this file and information about virtuoso version you are using.