bug#18918: 25.0.50; Images files won't refresh in OS X Yosemite

[Eli Zaretskii]

> Date: Sat, 1 Nov 2014 11:48:16 -0400
> From: Rick Frankel <rick@rickster.com>
> 
> Once an image (tested png and gif) file is opened in emacs, it will not update
> the image until emacs is quit an relaunched. I only noticed this after
> upgrading to Yosemite, but it may be present in Mavericks as well, but i have
> no way to test it.
> 
>  1. Open a png file.
>  2. Modify the png file on disk.
>  3. Close and reopen or refresh the png file.
> 
> The image will still display the original contents.

Does it help to invoke

  M-: (clear-image-cache) RET

?