OG Civil 3D Extension - Geological Interpretation

I am trying to build my 3D model, and I'm getting stuck with the geological interpretation manager.  Is my workflow incorrect?

1. Openground Cloud tab> Asset Management> Strata.  Then select the strata I want to create and model.  They appear as surfaces on my drawing. 
2. I click Openground Cloud tab>Interpretation>Create.  I am asked to select an alignment, which I do, then click OK.
3. ??? . Nothing happens.  Things return to normal as if I had not taken step 2 at all.  In the past I've had it ask me to pick the location for a cross section to be placed, and then it would create a cross section for me.  It's not clear what's different.

Anyone have this issue?  Is it just me?