The search is indeed case sensitive. I have not checked if this can be changed through any settings. However, one can provide any part of the name provided it matches case and it will find the notebook. As per example above, typing "book", "teboo", "MyN" etc will match "MyNotebook". I think earlier the search was case-insensitive. I also get a feeling the clipper has become a little slow. But that may be just my perception.