First, let me add that this blog was moved (with a lot of problems nonetheless) from a subdirectory of the domain up one level.
Now the new posts which contain an attached image don’t load the proper URL….
This screenshot shows the auto generated permalink as of now: Screenshot 1
Another interesting behavior is that the picture size is added to the name for some reason?! Screenshot 2
Let me add that all the settings for permalinks are the default ones.