Images not showing

[Birger52]

... from just one sender.
All other senders are fine.
Images are inline, and when viewing sourcecode of mail, images are there - they are just not shown.
Contact is set to show images.
Have tried to delete the contact - then I get the message about showing images, but no matter which option I choose - show or always show - there are no images shown.

roundcube 1.2 is running on my own server in apache 2.4.9 under WIN7.