I’ll advise the client to upgrade core. Thanks for looking into it!
That patch worked to fix the image upload, however it seems to have somehow triggered another issue. I also have Page Link fields in the same group. Without the patch applied, I can select a page link but can’t upload an image. With the patch, I can upload an image but I just get “Searching..” when selecting a page.
I’m seeing this error:
Uncaught TypeError: Cannot read property ‘length’ of null clientname.staging.wpengine.com/wp-includes/js/jquery/jquery.js?ver=1.10.2:3