I have changed my password and uploaded the pictures again. I had a pretty scrambled password, nothing someone could guess, but I changed it anyway.
Thanks for your response.
Pictures are back after uploading data (+ media) with the app
I have uploaded the data (+ media) from July 12th again with the app, and pictures are back again.
I can also do that for the training from July 18th, but maybe you first want to do some investigation?
I made many pictures for example on http://www.gps-sport.net/trainings/Maastricht-Bemelen-Maastricht_1675599 and on http://www.gps-sport.net/trainings/Duurloopje-met-Brigitte%2C-Maastricht-Borgharen-Itteren-Beatrixhav_1671375. They were visible last week, but now they have disappeared.