Project and sprite issue with 5.6.0f3

2D
1
  1. Failed to open another project or create a new one from menu File->Open Project in an open project.
  2. When i change the texture type from default to Sprite(2D and UI), the type of texture is still default unless i attach it to an image or sprite renderer.

Before attach sprite to image:

3032960--226918--upload_2017-4-14_16-52-24.png
3032960--226918--upload_2017-4-14_16-52-24.png729×498 34.5 KB

After attach it to an image:

3032960--226919--upload_2017-4-14_16-53-9.png
3032960--226919--upload_2017-4-14_16-53-9.png706×516 42.9 KB

2

The default setting of Sprite Mode is null after I change Texture Type to Sprite(2D and UI).
Why doesn’t set default to Single now?