InDesign randomly replaces placed images with grey boxes
Max OS 10.13.6
Indesign will on occasion replace all placed images in document with grey boxes.
Issue occurs seemingly randomly when moving elements in the document.
Issue affects all placed images in document, including .ai and .png images.
Issue is not document-specific, although seems to affect documents containing transparency more frequently.
Additional new images placed while issue is ongoing results in a grey box.
Changing Display Performance settings does not resolve issue.
Restarting InDesign resolves the issue.