I'm not sure if I can help you but:
Do you have an iPhone and have app version 23.1.0? (Go to More, scroll to the bottom). I'm asking since there seem to be more problems with it lately than with the Android version.
Also, go to More > Settings, scroll to the bottom and enable error logging, which may help customer service.
From older messages, such as this one, I understand that restarting the app should normally help.
I'm not sure if switching to a paper version is possible after you've started to use it. In any case, that should be done via customer service. Do mention you're currently travelling, since that means you're in the most urgent category.