I'm having trouble importing a DWG that has been exported from Vellum-Ashlar into Alibre. It's a drawing from my dad so I'm not sure if he exported it incorrectly or if I'm importing it incorrectly. He only knows how to draw in 2D so it should be a 2D file, however, I'm not sure how to confirm. After attempting to import, I am faced with a black workspace. I activate sketch mode and the workspace turns white but it is still blank. I have tried all four import setting combinations: maintain projection (y/n) and import visible layers (y/n) but the results seem to be the same. Am I doing something wrong or is has the file not been exported correctly?