SOLUTION TO "UNABLE TO COMPLETE ACTION"
Make sure you are logged out of the game. Then
1. Close your browser
2. De-activate your anti-virus. If you are using bit-defender you can just turn it off on the system tray.
3. Restart your browser.
4. Log-in
You can re-activate your anti virus after logging in but when you log out and want to log back in again, you will have to repeat the above process again. This is just a temporary fix.