This is almost always a SQL issue. Run the "Aspen Properties Database Configuration" utility as an Administrator to re-link the databases.

Before starting, ensure your machine meets the technical demands to avoid "hangs" during complex simulations. :

How To Install Aspen Hysys V12 Better

This is almost always a SQL issue. Run the "Aspen Properties Database Configuration" utility as an Administrator to re-link the databases.

Before starting, ensure your machine meets the technical demands to avoid "hangs" during complex simulations. :