Ok so I started a drawing, then saved it and said I'll finish it later. Now when I go and start a new drawing and click on it at the bottom to start drawing on it again, It'll take me to the page but the drawing screen is white like I never drew anything, but at the bottom where I can edit it, it shows me the picture, so I know it's still there.... Im freaking!!
My best guess is that your computer just isn't loading it right. Sometimes when my computer loads it freezes or won't show certain things. Perhaps you could try shutting down your computer, then turning it back on? If the problem fails to go away, try contacting a Moderator that can help you.