I'm not sure what you mean by YouTube lists are empty.
What's the full model of your unit, and which on-screen keyboard (widget) are you using when it stops working after two characters?
updated firmware yesterday, youtube lists are empty, i cannot search for videos- i can only input two characters, then keyboard goes dead. I have the LNB750 LCD (2009 model). The other Yahoo widgets work but I do not like the lack of video on Yahoo Sports- most of the graphics are still pictures.