Hey all - I’m actually having the exact same problem and have followed all of the exact same troubleshooting steps as the thread linked below. Unfortunately the thread below does not contain a resolution and is no longer open for additional posts. I’ve also copied the original post below updated with my version of EE and additional details. Thanks in advance for any advice!
https://ellislab.com/forums/viewthread/210955/
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The site in question is running EE 2.7.1. Everything was working just fine on the site until a few weeks ago. All of a sudden, file uploads stopped working completely. Users could upload files in the CP, and they’d receive “Upload Successful” messages with all of the files’ stats (e.g., file size). However, the files didn’t exist within the actual upload directories on the server, resulting in display errors, broken images, etc.
I’ve double-checked the file permissions on the upload directories, and they’re all set to 777 and the hosting provider says that they haven’t made any changes to the server. The hosting provider has attempted troubleshooting with luck. Also, there aren’t any related PHP or EE error messages.
Additionally, I can add that this functionality still works in my development environment and on the production directory on the same server (/public_html/ works fine but /stage_html/ does not any longer).
Any ideas?