During the hours of around 3:00pm to 5:40pm EDT (which is GMT minus 4 hours)
the code that builds your CommCare apps was silently failing. Any build
created during this time will show up as invalid on your phone. To fix, go
into the release manager in Edit mode, and click the blue ‘x’ next to the
failing build to delete it, and then you can Make New Build from scratch.
Only builds made during those hours are affected, and it should be working
fine now, so this probably won’t affect most of you.