Here's a fun one for you! With 38.2.5, create a new project with just a few images. Now turn off Use folder thumbnail for icon. Right away, you'll probably run into some strangeness. But save, close, and reopen the project for the real excitement. You'll see something like the attached screenshot, and the console will be full of the attached console dump.

ETA: I had to sleep on it to figure out what condition was causing the mayhem.