I was using 1.1 until this update today. My quick inventory type keys were END / DELETE buttons over the arrows but TAB always allowed me to go back 1 section in my inventories but now I cannot do that and cannot find how to assign a key to it so this means if I open a book I have to completely exit my inventory then go back in to do something else....am I missing something extremely simple here?

I know -- me too. After the last update, Bethesda implemeted the ESC key for backing out of most of the dialogs (books, inventotry, etc).