Dear Dr. Vanchiere,
There is a SQL function that needs to run on the back end, generating a temporary table in Postgres, before data can be extracted from the system. What is your operating system?
Here are part of the instructions that state how to run it and how to make sure it runs automatically on your system in windows: http://www.openclinica.org/pipermail/users/2006-June/000025.html
Here is a similar thread, describing the process in Linux: http://www.openclinica.org/pipermail/users/2007-August/000224.html
Hope this helps, Tom Hickerson