like i replied to you in email, it’s unlikely that last update has broke anything JSON-related as the (only) major change has been related to a specific view - login form. it’s more likely that your problem is a coincidence or somehow device specific.
you can try using a different network connection on your phone and/or enable transport debugging in app settings and use adb logcat to check if there’s anything obviously wrong with the received JSON.
I hadn’t been able to check on my computer and there I get a completely different error messages which seems to indicate server issues. So it’s most likely that.