Some odd Android app behavior with boarding passes today.

I did a back to back via AMS, then on to PHL. First flight was a reward flight booked with BA, the remainder being ticketed via American.

The AMS flight out was fine.
The return LHR flight was fine - and it checked me in for the PHL connection at the same time, but only downloaded the LHR boarding pass. I figured it was because it wasn't T-24 for the PHL flight.
T-24 for PHL comes and it still won't download on the android app - goes to the 'check in' page - reports me as checked in and won't download the boarding pass.

I fire up the ipad app and happily download the boarding pass for the PHL flight.

Following morning (pre flights) I try again via the android app.
I also retried after the initial flight to AMS and I retried from the F lounge before the PHL flight - it just completely refused to download that boarding pass.

All it ever did was take me to the check in summary screen.