Activity.getActivityInfo().currentLocation is null since latest firmware

Current location will go "stale" after a period of time, and the amount of time can vary by device type.

Once stale, it will be null.

Start up an activity (like "run") that uses GPS, wait for a GPS fix, and then exit the activity. Your app should then see a valid currentLocation.
What's commonly done is once an app sees a valid current location, the location saved to the ObjectStore/Application.Storage, so when currectLocation does go stale, they's a default that can be used.

So the basic flow I use is at app startup:

get Activity.Info.currentLocation
if null, get data from Object Store, if not, save info to ObjectStore
if still no data, display error

After the first time you have a valid currentLocation, your app will always have one.