After upgrading to Expo 14, I noticed that the header section in the Drawer no longer appears. It seems that the renderHeader method in the DrawerNavigation component is no longer doing anything.
Which navigation library are you using? Can you post source code?
I actually seemed to fix the problem over the weekend. It turned out to be a styling issue. I had some styling in place for the drawer before I upgraded Expo, and once I did something must have changed behind the scenes to cause this styling to display differently. So I removed one line of styling and it started working again.