It just had a similar problem on my local machine, however it is still in the dev environment.
For me, I did not have permission for the group to access the folder with the default media cache, which remained empty after the linden tree: imagine: cache: remove and page reload. Thus, the images were associated with an empty folder.
To fix, I first made sure that the group was set to Apache _www (mac) / www-data (linux), for example.
- sudo chgrp -R www-data web / media / cache
Then make sure the folder is set to read, write and execute, for example.
- sudo chmod -R g + rwx web / media / cache
Hope this helps ...
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