Objects not appearing in shared document

A colleague was having an issue where she can’t see layered objects (images, nested groups, etc) inside a shared document. Others team members able to see the elements and the document looks fine - is this most likely a memory issue on her end? I suggested she try erasing the cache and restarting, which seems to have helped for now, but I wonder if there’s anything else she should be doing to avoid this issue in the future.