Since this morning (6/11/14) the TweetDeck App has been having issues, due to someone discovering and exploiting a security flaw in the app. As a result, users of the TweetDeck App have been encountering the message various error messages througout the day.
As of 10:45am (CST USA), it appears that twitter is having connection issues. This appears to be affecting both to the website and 3rd party apps. The Twitter status page shows a message that “Users may be experiencing issues accessing Twitter. As of 12:45p (CST USA) It now looks like whatever caused the issues at Twitter have been taken care of. Access appears to be resolved both via the website and on 3rd party Twitter apps.
For those who open TweetDeck and only get a blank screen, here is the simple solution to the issue.