I havent tried this lately but I can verify that the same thing used to happen to me as well. What I found out was that the text input field activates the continue button when you start TYPING. Since we all normally copy/paste embedded URLs, the 'continue' button would not activate until you clicked somewhere on the screen.
My theory was that even though you pasted something in the field, which is a required field, it did not know it since you never typed anything. Simply clicking your mouse in that field didnt work. Clicking somewhere on the screen, it could then tell that the field was not NULL and activated the continue button.
Again, I have not yet tested this with 7.1.4 yet.