Hi Paul,
I am Vijay, an Independent Advisor. I am here to work with you on this problem.
Is the size of the cell large enough to contain the picture?
Try repairing your Office installation. First try Quick Repair (takes 5 - 10 mins) , if that doesn't help then try Online Repair (Takes more than 30 mins but less than 1 hour in general)
Note for Office 2013 and below - Please repair only if you have product key with you as sometimes it asks for the product key again after the repair.
How to repair instructions -
https://support.office.com/en-us/article/Repair...
Do let me know if you require any further help on this. Will be glad to help you.