The eraser tool doesn't work on *one* file. It makes a shape with an outline instead (screenshot attached).
I can't attach the file because "The attachment's bu_dr_gm_boerboel-002.ai content type (application/postscript) does not match its file extension" so I'm thinking that might have something to do with it.
I haven't changed anything as far as how I save .ai files (screenshot attached).
I've checked it with other files, the most recent one I made before this one and older ones. Also I updated illustrator to the latest version and restarted the machine.
Thanks in advance for any advice.
Using the Eraser tool, it shouldn't look like shown in your screenshot if the black paths are plain filled objects.
To have a look at it, you may share the Illustrator file via Google Drive, Creative Cloud storage or any other file sharing service.
I downloaded and opened your Illustrator file. I selected the "man-dog" shape:
Then I selected the Eraser tool and dragged across the artwork. This is the way the Eraser is supposed to work: