We are aware that some players are unable to play Daily Challenge due to loading issues.
Sorry for the inconvenience. We understand how important this feature is to your gameplay, and we'd like to let you know that we're already working to fix it as quickly as possible.
If you haven't done yet, we recommend that you to try these troubleshooting steps:
For Android: https://zynga.my/BWFTSandroid
For iOS: https://zynga.my/BWFTSiOS
In case you continue to experience issues with your Daily Challenge, please reply back with any details or screenshots that can help give us a better understanding of your issue so that we can provide you with the best possible resolution.