Image mising in reports

[1minManager]

I have a client with a Google Docs report template file we haven’t changed in months. About a 3rd of the images (roughly 10ish) are missing and instead show something like this

Note how the lower image is fine. Also when you click on the link it opens up ok in a browser.

The user reports that if they rerun the report it seems to be the same images missing each time

Any ideas?