No drawing appears in drawing tab?

Hope I get get some help, I’m new to the app and paid for the pro version and having issues. With the drawings tab. It seems I can get all my info in up until I get to the end and when I hit the draw tab I get no drawing just a circle in the center of my screen almost like when I refresh my e-mail on my iPhone. Is this normal ? I waited 5 min and still the same result. Any info is greatly appreciated 

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No. That is not normal. Did you specify all box dimensions and parameters?