Is this MoneyWiz 1 or MoneyWiz 2? What's the Android OS installed there?
I'm afraid that MoneyWiz 1 doesn't run very well on Android 6. Android 6 has been released after we've stopped supporting MoneyWiz 1 (releasing updates) so we're unable to issue an update that would fix this.
If you want to continue using MoneyWiz, you need to either upgrade to MoneyWiz 2 (http://moneywizapp.com/buy/) or downgrade your Android OS.
I am really sorry for the inconvenience this is causing!
I'm afraid that even though you can sync your MoneyWiz 1 data to MoneyWiz 2 as a one-time migration, once you sync with MoneyWiz 2, you cannot use MoneyWiz 1 anymore so you'd both need to upgrade.
There is no risk of data loss when upgrading. You can keep MoneyWiz 1 installed on your iPhone so that it'd act as a backup when migrating if you want :)