zloe

Ok, i eliminated all other errors and warnings and it came to this one. It causes the problem. Has something to do with extension of the files:
PHP Warning: in_array() [<a href='function.in-array'>function.in-array</a>]: Wrong datatype for second argument in /public_html/wp-includes/functions.php on line 1813

Found this in logs

[error] PHP Notice:  Use of undefined constant E_USER_DEPRECATED - assumed 'E_USER_DEPRECATED' in /home/.../public_html/wp-content/plugins/codestyling-localization/codestyling-localization.php on line 2491, referer: https://www.****.com/wp-admin/post.php?post=671&action=edit
[error] PHP Warning:  in_array() [<a href='function.in-array'>function.in-array</a>]: Wrong datatype for second argument in /home/.../public_html/wp-includes/functions.php on line 1813, referer: https://www.****.com/wp-admin/post.php?post=671&action=edit

I have Esplanade theme.
And i have installed next plugins:

Captcha 3.8.2
CodeStyling Localization 1.99.30
Super Simple Google Analytics 1.7.1
W3 Total Cache 0.9.3
WordPress SEO 1.4.18

gfewjf do you have one of this plugins installed? And also what theme do you have?

I have the same problem. After i upgraded to 3.6.1 i have the same problem with uploading media files. Got the same error:
An error occurred in the upload. Please try again later.

But if i set in wp-config.php this lines it works:
define(‘WP_DEBUG_DISPLAY’, false);
@ini_set(‘display_errors’,0);

Still trying to debug what is the problem.