The Drawing needs to be reset, it usually means the zoom function has been used on the image.
To reset:
Right Click on the Drawing Image window
Select Reset View
The Drawing should reappear on screen.
TakeOff - Drawing not visible on screen
When in the Take Off module a drawing is open and I can see the measurements but there is no image of the drawing being displayed on screen, flicking to 3D mode shows the drawing.
Written by Norbert Botocan