Hi Kristin! The problem is solved 🙂
I searched in your media folder for “rowing” and there was a reference to this image: https://www.mpslakers.com/wp-content/uploads/2014/10/rowing.jpg
Image files, when uploaded to WordPress, create a new post that is like any other post on your website. When the image name “rowing” was created, it also created a post called “rowing”, so it was no longer available from that moment.
I checked all of this through a search in the Media folder; “rowing” was still in there.
Although that image url was stored in the Media area (which is essentially the database), the file was broken for whatever reason. So I deleted the “blank” file, then went to the “rowing” page and changed the url accordingly and it worked.
I’m going through some other parts of the site just to see if there’s anything that could obviously be improved.