After loading ./www/index.html
The Code and Design tab selections did populate, and appears to be working.
the dimensions for the "Tablet setting: size", were not retained, I had to modify and enter my original 1280x800 selected.
Selecting "File->Open" was inactive/inhibited in the "DEVELOP" tab, immediately after performing the XDK update.
In order to perform the "File->Open" selection, I had to select "Explore Services"
and then I was able to successfully perform "File->Open" ../www/index.html to activate the "CODE" and "DESIGN" tabs