I Experience Constant Loading with the Twitter Ads Overview Metric
For certain Advertiser accounts, the Overview metric can be problematic. In order to retrieve that data, it must be requested in batches.
If you're experiencing trouble with the Overview account, we recommend single Metrics instead.
Connection Error/Problems (Old Widget That Was Previously Working)
Most likely Twitter expired your third party connection. (Instagram, Twitter, Facebook, Linkedin, Google, etc do this to third party connections every 60 days or so -- there's no way to stop this, or a connection can be expired upon changing a password).