IB users that upgrade the TWS may experience connectivity problems. The upgrade has unchecked a setting in the TWS global configuration that is important for the Ensign connection. To re-apply this setting click on the TWS and select menu Edit | Global Configuration.
Then select Display at left , click on the styles submenu , and recheck the box at top that says “Use system title bar” 
You will need to close and reopen Ensign to establish the connection.