A solution was found in the comments here ( http://stackoverflow.com/questions/29086666/nova-launcher-squashed-app-drawer-on-nexus-10https://stackoverflow.com/questions/29086666/nova-launcher-squashed-app-drawer-on-nexus-10 )
Clearing Nova Launchers Cache & Data, Force Stopping the App and then re-launching solves the layout problem, looks like a bug in Nova Launcher.
