Something happened in the past 2 weeks that made Google Camera app and the "GPX Viewer" app unable to get location data.
First I noticed that GPX Viewer does not show my location on the map. I tried clearing cache, storage and then reinstalling it, nothing helped. Since current version was released a couple of days ago, I thought the issue is probably on their side.
However, today I noticed that Google camera does not add the location tag to photos either. Tried to reinstall it, also reinstalled sandboxed google play services, still does not work.
I have another app on my phone called "GPSTest", it works fine, it can acquire location. While "GPSTest" runs, I can see the green dot on the top right corner of the screen. It is, however, not there when I run "GPX Viewer" which I guess is an indication of the problem.
It seems unlikely to me that 2 different apps got GPS issues at the same time.