Firefox Mac No Longer Allowing Photo Uploads

Hi, I'm updated to the newest Sytist version and Firefox Mac (multiple computers, different Firefox versions, including 54.0.1) is no longer processing image uploads to galleries. It's saying IO Error after the file info in the uploader and then xx failed to upload, like the attached screen grab. It doesn't matter if the image files are large or small, or uploaded to existing or newly created galleries. Safari and Chrome are fine so we have a workaround for now.

Could this be addressed in the next Styist update? Thanks very much!

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I Just now I uploaded 2 images to 2 different areas of my site using Firefox 54.0.1 on my MAC without trouble. Have you tried resetting firefox?

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I/O error is a server error (Input/Output). Something must have changed on the server and you should contact your host about the error.

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Gotcha. I will investigate further. Thank you!

Edited Fri Jul 14, 17 11:29 AM by Aaron W

I cleared the browser cache etc and I'm still coming up agains the same issue. All uploads in FF Mac are failing due to an IO Erro. Is there any debug / error log or anything I could give to my web hosts regarding this issue?

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As said by Tim, this is a server error so clearing the cache of your mac will not solve the issue.For instance Godaddy limited my file upload files number to twenty, without giving me advice of it.So trying to upload a number of files higher then twenty resulted in a I/O error.The only way then was to upload files with FTP, and of course I moved to Siteground.
Again you should check with your host what is changed for instance the multiple files number limit to upload.

Edited Sat Jul 15, 17 4:36 PM by Marco Cappalunga