Yes, changing the owner of either the web application or the web Map containing the feature data will cause the web map to fail. A good suggestion would be trying to change the owner back to who it was originally. If it still fails then after your co-worker has remade the map journal, avoid changing the owner.
When I say recreating, I basically mean opening the web map and publishing it again using the map tour template. There are two ways to do this;
1) If you want to create a web Map from the template:
a. Open arcgis online and login
b. Create a new map, do not add any layers
c. Save the web Map with a basemap only
d. Open the builder and add points and images in the builder.
e. Save the map.
2) If you want to create a Map from file
a. Create a Map in ArcMap desktop
b. Create a shape file or layer with the following fields
The values for fields name required are as follows (case insensitive):
1. Name: name, title, name-short, name-long
2. Description: description, caption, snippet, comment
3. Picture: pic_url, url, pic, picture
4. Thumbnail: thumb_url, thumb, thumbnail
5. Color : icon_color, color, style
c. Publish the Map to arcgis online as a web map
d. Create a Map Tour template from the web map.
e. If you need to make changes , change the Map document in ArcMap desktop, republish recreate the template.
Unfortunately, as far as I know, there is no way to recreate the map tour if all the points and images were added in manually.
