Version 17 generates Thumbnails very differently to version 14

I have just updated from X4 to X7 and have problems with the display of Thumbnails.  Version 17 displays thumbnails differently than v14 did. Version 14 created the thumbnail from the layers which were Visible. Version 17 generates thumbnails from the layers which are Printable.

This means that many of the thumbnails of my existing templates, when converted to v17 format, are just plain white boxes giving no clue about the content at all. Surely the thumbnail should be generated from what is Visible, it should be miniature version of What you see in CorelDraw. 

Is there any way to change how the thumbnails are generated in V17?