I don't use it from my phone but downloaded it on my kindle last night and tried to get on ratrod bikes with it and couldn't figure out how to open rrd with it. Of course that may just be operator error
What version and operating system are you on? On Android, go into app manager and delete your cache. This will force you to log in again but may fix it.
If you're using the original on iPhone, you may need to update it. But be warned the new version is different. I personally don't care for it but I'll refrain from getting into that.