Yesterday I received the following reply:
"There must be a setting on your computer that stops the download of external image from certain sources.
At this point we have no clue what might cause the issue and cannot offer a solution, unfortunately."
I replied giving a second link to this forum post suggesting that there was something wrong with Vers 10, if people have been able to view images in vers 9 and ten minutes later having upgraded to vers 10 they are unable to view them. Certainly in those cases there would NOT be a "setting on the computer" which was at fault.
I'm NOT certain but on my previous version 6.8.8 all HTML emails displayed an icon which if when clicked offered the option to display the email using a browser and I seem to remember doing that. Then I could see the images and print off such emails through the browser's facility. With vers 10 I'm unable to do that.
I only upgraded to vers 10 because GMX mail sent me an email saying that they were NOT going to support email clients using TLS 1.0 & 1.1 in future. An upgrade seemed the logical choice.