I had the same problem. I signed up for 7 PM CET but the app quickly became unresponsive right after start and I didn’t see the other cyclists. It did however look like I was going up Box hill before I gave up and closed my Android app and signed up for 9 PM instead. This time it worked better, but the app was still lagging. I was sent up Box Hill again and continued up Box Hill and Keith Hill. Wasn’t sure if I was in the race and ended the ride after 20 km. No email after the ride and I guess it wasn’t confirmed.
It’s really frustrating considering I also don’t have any resistance on my trainer (I know, different issue). I have the latest Android version 1.0.32519 on my tablet Lenovo Tab 4 10 Plus.