In Chrome (actually IronPortable), opening a page in Visual Editor which has a number of large images causes some images to only show the image link with a red line. Then for no obvious reason (similar image wikitext, just with the File: and the width specified)
Same occurs in IE and Edge.
Looking at the logs of the Parsoid instance:
The persistent error shown in the logs about the CAS User update and the API response error for PreprocessorRequest
This is using MW 1.28.
Happy to provide further details.