I had a problem this week with the latest android app. When I opened an email in the app the text would display for one second and then all disappear. As you can imagine this was very annoying. After some research it seems that this happens on quite a few different devices. From what I can tell it seems like this is caused by a data corruption in the rom.
Anyway the solution
1. Clear cache
2. Clear Dalvik cache
3. Fix permissions
You can fix permissions with rom manager or in your recovery menu.