Cannot select "I need more time"

If my child is using the computer and runs up against the time limit, I am unable to login and extend the time for her.

 

When the time limit is up, she gets the dialog and I choose "I need more time".  The dialog comes up for my credentials.  Once I start typing in my email as soon as I type "@" the dialog goes away.   Waiting to type "@" until the end, the dialog still goes away.  I've never been able to type in my credentials to see what comes next.

 

I have seen this topic twice in the boards so far but the users state the problem just goes away.    Has this ever been reported as an actual bug? 

 

Thank you!