I have a drawing I did in Sketch Up Free version and saved as an .skb file. All is good. Upgrade to Pro, opened up the file to edit, still good no issues. However when I export to dwg the drawing shrinks a bit.
I tried camera > parallel projection that didn’t do anything. I’ve tried both 2D and 3D exports, still the same. I can’t see any options to change scale or anything when exporting.
For example my x axis dimension in the skb file is 14" but the dwg is 13.227. The drawing is just simple 2D.
FYI: the Sketchup using .skp as a file extension. .skb is a backup file: The backup file is the previously saved version of the file and lives in the same folder as the model file. See more here: Setting Software and File Preferences | SketchUp Help
You have been drawing your plan on the red/blue (xz) plane that in CAD and SketchUp is usually seen as the “front elevation”. The red/green plane (xy) is what usually represents the “ground plane”. If you develop your plan into a 3D model this might lead to some clumsy navigation so perhaps you should rotate the plan to the “correct” position.
Probably what was at a slight angle was your viewing direction.