WordPress Upload Media to a post issue

Question

I'm struggling from an error on WordPress 3.8.1.

Whenever I try to upload a media to a post, it does not add, it says An error occurred in the upload. Please try again later..

But the weirder thing is that it is shown on dashboard/media/library even after this issue.

I also cannot see uploaded attached media to my posts (edit post / [add media button]) / media library / uploaded to this post, but in dashboard/media/library section , these old uploaded images are shown properly that which is uploaded to what post.

I have tried the followings:

• Re-installed both my local version and en_US from both update manager and manually
• Deleted wp-includes and wp-admin folders and replaced them manually.
• I have checked chown and chmod of the wp-content/uploads folder. To make sure they are working, I have deleted wp-content/uploads/2014 folder, and after first upload that shows this error, the folder is created with right chown and chmod and files were there (wp-content/uploads/2014/01/26/file with resolutions.jpg)
• I have deleted unneeded plugins, deactivated all plugins and themes, switched back to WordPress's default plugin, I have even reset active plugins json object at wp_options from SQL, did not help.
• I have enabled php error logs, nothing related is shown
• I have altered the WP_DEBUG definition to true, I have even defined WP_DEBUG_DISPLAY to true, no help.
• When I try to add from wp-admin/media-new.php , using multi uploader, file is freezing at "Crunching…" step, but old browser upload works flawlessly.
• I'm managing the VPS and hosting the blog myself with CentOS 6.5 x64. safe_mode is set as off. There is not a mod_security option in my php.ini. My upload_max_filesize in php.ini is set to 20M, memory_limit is 256M, only 3 sites are hosted and memory is quite empty while testing these. This also happens even with 50kb .jpg images, so this should not be related.
• I have re-uploaded all wordpress files from a clean downloaded zip, no help.
• I have tried adding AddType x-mapp-php5 .php .php4 to the end of .htaccess as suggested here, that did not help at all.

The thing is that, I have tried a clean installation to another domain on the same server, it is working as it should.

What could be the problem? How can I fix this?

Thanks in advance,

Answer 1

See if custom post type has any files that are in UTF-8. If you change it to ANSI, that should help, if thats an issue.