WP 4.8 on IIS unable to upload media

[mikeolee]

We are having this problem on instances running WP on IIS 8. When we updated to 4.8 the Media area and media uploads are not working correctly. Trying to add media from within the WYSIWYG editor for all content types does not work. We are getting and error that consists of the name of the file "my-file.png" and the error "An error occurred in the upload. Please try again later."

We get this error in the Media library as well when trying to upload an image, BUT only in the "grid" mode and the file seems to actually load as we see it when in "list" mode. When in the "list" mode it seems to work, but the blue task bar seems to get stalled on "Crunching..." but the file, again, is actually uploaded.

[mikeolee]

Error as seen on Insert Media

[mikeolee]

Shows Grid view with wheel that just spins

[joemcgill]

Hi @mikeolee,

Thanks for the report. Can you give us any additional information about this error?

• Are you seeing any additional errors in your browser's javascript console?
• What browser are you using, and can you reproduce it on multiple browsers?
• Do you have any plugins installed or theme functionality that would affect image uploads?

Thanks.
Joe

[mikeolee]

The Console gives 'XHR finished loading: POST "​https://ourURL/wp-admin/admin-ajax.php".' about every 10-30 seconds, but nothing else.

We are getting the same issue in Chrome, FireFox and Edge (all latest stable versions).

Regarding Plugins: We have disabled all plugins in two of our installations, and the issue persists.

Regarding Themes: I did not try this earlier, but when trying to add a theme to switch to, we received the following error:

"An unexpected error occurred. Something may be wrong with WordPress.org or this server’s configuration. If you continue to have problems, please try the support forums."

Replying to joemcgill:

Hi @mikeolee,

Thanks for the report. Can you give us any additional information about this error?

• Are you seeing any additional errors in your browser's javascript console?
• What browser are you using, and can you reproduce it on multiple browsers?
• Do you have any plugins installed or theme functionality that would affect image uploads?

Thanks.
Joe

[mikeolee]

This was an issue with the Theme we were using. This caused several issues relating to the media area with did not allow for several items in WP 4.8 to work.

[laptopleon]

I'd like to add that we had identical symptoms, (error text at uploading, spinning wheel, images still uploaded despite error text, yet not being able to use them in the editor, etc – on Mac OS 10.11 Safari, Firefox and Opera, and Windows browser by our client) though on a Linux webserver. Despite errors and refusing screens, images were added to the Media Library, but couldn't be used in the editor.

We're also using a multisite, with a custom theme.

For now, we rolled back to 4.7.3 until there is a fix. (We suspect the bug is in since 4.7.4 or 4.7.5)

Should we open a separate ticket for it?