Blank screen when you come back to the app (Android)

0.4.0 removed the big Gratin logo that could appear after returning to the app, but a blank screen could still show, sometimes after only a few seconds away. In the next release: when you come back to Gratin it now asks for a fresh picture of the page instead of waiting for a tap, and anything that still shows before the page draws is in your theme's colour rather than white. We haven't been able to make the blank screen happen on our test phones, so if you still see it, please use "Contact support" in Settings straight afterwards: the email includes how the app last stopped, which tells us what happened. Reported by a beta tester.