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Everytime I open my last project in the Flow Analysis, my results from the last session are gone, like Stream Lines, Sections, XY Plots etc.
I always save the file and the project and open the .spro file, which is created automatically everytime I save the file.
I see this post is two years old so hopefully you got an answer.
If not... Click on Project (there is a drop-down menu) and then select Load Results. You can then browse to your results file and load it.