Thx Sayontan, it works!
... and I found out that the reason was a "https://..." as the image-adress (google-picasa stored), when I changed it to "http://..." it also resolved the matter. Although picasaweb gives "https://..." as the adress and it did work before the change to 3.7.7. So it might have to do with the way you resolve the images adress, possible??