Inroads XM - Surfaces not staying in project - What am I not doing?

Each time I open a project I have to reload all surfaces.

Say I have a project called Alpha. I load 12 surfaces, work for a day, save project and all surfaces then get out.

Next time I open it I have to load all surfaces again, one at a time.

 I'd like to already have them loaded, or still loaded when I return.

 

What levers aren't I pulling?

 

Thanks in advance

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