AQT has been configured for use with PostgreSQL v7.3 and above. This release introduced schemas into PostgreSQL, which is a significant change to the database, and a significant change in the way AQT displays information in the Database Explorer.
If you are using a release of PostgreSQL prior to v7.3, you will need to use a different PostgreSQL cfg file. You do this as follows:
The Admin Component will only work with PostgreSQL v7.3 and above.