I crashed when trying to access the source title for the source 1880 US Federal Census. I reopened and compacted the file. I tested other source titles and the 1880 US Census is the only one that crashed when selected.

So I listed the sources by person in the source tab. It is a file I've created for someone else so it is relatively small (350 people). I could select the 1880 Census source citation for all but one person without crashing. So I've identified the exact source citation causing the crash. I deleted the associated media file through the media tab.

I even tried deleting all people linked to that citatation. Nothing works.

I went to a backup file from about a week ago and it has the same problem. It was just something that wasn't noticeable until going to that source to try to edit.

Any other ideas why this happened and how to resolve it?