If you have a saved project that is pointing to a server using Windows Auth and follow these steps you will find it such a pain to enter a password!
Type in a server name that will require SQL Server Auth
Select SQL Auth
Enter the user name (ex sa)
Click in the Password box to enter the password, the UI will stop responding
Why you are waiting for the ui click in another window on screen and then go back you will find that it doesn't respond well each time you go back.
When you are trying to enter the password you will also have problems entering the password as it will stop accepting input after a few characters. When you click off and back on to it still doesn't respond. You will see sometimes it will show your cursor in the dialog but fail to respond to input or not flash the cursor and become unresponsive.
After a long time of this the other day I finally got an out of memory error with the program. If there are any logs I can send you I would be happy to.