Odd issue I'm having here ...
I was looking to upload to Youtube, so I found the option in a "Right Click" drop down box on a video and then a log in box for Youtube appears but, I cannot type in the box to put in my username and password. Any clues ?
I can type into Notepad and mouse copy n paste from there into the log in box I cannot type directly inside the box.
Can you provide a screenshot of exactly which boxes you are unable to type into? Is it this one?
I was unable to recreate the issue, so we may need to get some more information.