It is recommended to save often when working with Menta.
We have experienced lockups of Menta when we conduct very long programming sessions.
Save often. When you take a break, shut down Menta and then restart it when you return. This will help you to avoid losing time should Menta freeze up which is known to happen. It is good practice to let Vista DB folder structure be the file cabinet. When a change is required, export the application from Vista, make the changes, then re-import to Vista and download the controller. This will keep your field environment in synchronization with the operator interface.