I have a Nexus 7 (wifi only) and I have cached plenty of maps in past. I have updated the app but now I no longer see the "download map" button on the map screen. Here is what I have done.
- I made sure I was on regular wifi.
- Made sure that i was zoomed in to a "cacheable" level.
- Made sure I chose a map section that I have not already downloaded.
- Reinstalled app.