Couple of issues on Portrait:
- the Nav Drawer is better but not quite right, meaning when you open the nav drawer in portrait mode in any android app, it covers 4/5 of the screen or so, not 1/2. Also the drawer contents are way too small, too scaled down (maybe they will scale better when the drawer will cover more of the screen).
- having a tab menu for example in portrait then rotating the phone will break the menu (it won't show properly). Same thing the other way around (Landscape to portrait)