I dont’ think the size of the photo is the issue as that was the first thing I tried to fix in your file. Also when I loaded in sbeeners sample photos into your big photo MC they loaded off center but they loaded.
I still think you might have some corrupted images, though they open just fine in Photoshop and Firefox browser? :h:
Will you be posting this project on the web? If you have Photoshop try doing a “save for web” on them, see if that helps any? Also just try some other pics to see if they work.
cheers,
:hr: