(same here, cant upload to youtube, to mediafire or any other filesharing web, and i cannot even attach a file to a yahoo mail using mozilla. i can however upload using ie )
I found that on internet somebody have the same trouble.
Last evening, I was unable to type letters in the search box of Google. I tested typing on my notepad.
That was OK. Again I tried Google and another site for translation service. Unable to input again.
Recently I am enjoying what's happening on ie