After changing text in the templates (from 7 through to 14), the following happens.

 Fig. 1

Going to the Home page (Public or Admin), the following appears:-

Fig. 2

Looking in Setup, Template Settings, Show Previews - I see the following:-

Fig. 3

I do not see any more examples! If I choose another template, I can't change it in any way.

  Fig.4

The same thing happened in TNG vers. 9.2.2

Fig. 5

The problem occurs in IE11 as in Google Chrome operating on Win7 , Win8 or IOS7

The installation of TNG10 was a new installation on a new location on my hostserver.