Please try de-authorizing and authorizing again.
Steps to De-authorize
1) Switch to Library Mode by clicking Library button
2) Select menu item Help--> Erase Authorization or Press Ctrl+Shift+D
3) Click Erase button to De-authorize
Steps to Authorize
1) Launch ADE
2) Switch to Library Mode by clicking Library button (if you are in Reading Mode)
3) Select menu item Help-->Authorize Computer or Press Ctrl+Shift+U
4) Enter the valid credential to Authorize
Hope this solves your problem.