Anyone knows how to delete these broken image from the page reporter plugin?
I do not have this plugin but logic says there are only two places,
1. The property display of the image should show where it is located, delete from there.
2. If it is not there and it is an orphaned image (as in your case) then it has to be in the table that is created by the plugin. I do not know the name of the table but look at your db tables and see if there is anything called page reporter then find the image row for that orphaned image by name or number, and del that row.
They are not there..
always make a backup of your db before you make any changes if your not sure what your doing.
in your db there is usually a special table name for each plugin, you would need to look for something like page reporter in the table name. Make sure you have the image data first, you will need the name of the image.
Then look thru that table and find that image name and remove that row...